We have the explicit formula for y(t): y(t) = (t^3/6 + (A - K)t) + K
where A is a constant determined by the initial condition, and K is the constant of integration.
To solve the initial value problem and find an explicit formula for y(t), we can use the method of separating variables and integrating.
Given: ty' = 1 + y, y(1) = 3
Step 1: Separate the variables
ty' - y = 1
Step 2: Integrate both sides with respect to t
∫(ty' - y) dt = ∫1 dt
Integrating the left side:
∫ty' dt - ∫y dt = t²/2 - ∫y dt
Integrating the right side:
t²/2 - ∫y dt = t²/2 + C
Step 3: Solve for y
Now we need to solve for y. To do that, we need to find the integral of y.
∫y dt = ∫(t²/2 + C) dt
Integrating the right side:
∫y dt = (t³/6 + Ct) + K
Where K is the constant of integration.
Step 4: Substitute the initial condition to find the value of the constant
Using the initial condition y(1) = 3, we can substitute t = 1 and y = 3 into the equation:
∫y dt = (t³/6 + Ct) + K
∫3 dt = (1³/6 + C(1)) + K
3t = 1/6 + C + K
Step 5: Simplify and solve for C
3 = 1/6 + C + K
Simplifying:
C + K = 3 - 1/6
C + K = 17/6
Since C + K is a constant, we can let C + K = A, where A is a new constant.
So we have:
C = A - K
Step 6: Substitute back into the equation and simplify
∫y dt = (t³/6 + Ct) + K
∫y dt = (t³/6 + (A - K)t) + K
Finally, we have the explicit formula for y(t):
y(t) = (t³/6 + (A - K)t) + K
where A is a constant determined by the initial condition, and K is the constant of integration.
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< The function P(z) = -2.5x² + 2000-3000 gives the profit when zunits of a certain product are sold. Find a) the profit when 60 units are sold dollars b) the average profit per unit when 60 units are sold dollars per unit c) the rate that profit is changing when exactly 60 units are sold dollars per unit d) the rate that profit changes on average when the number of units sold rises from 60 to 120. dollars per unit e) The number of units sold when profit stops increasing and starts decreasing. (Round to the nearest whole number if necessary.) units Check Answer
a) The profit when 60 units are sold is $1,000.
b) The average profit per unit when 60 units are sold is $16.67 per unit.
c) The rate that profit is changing when exactly 60 units are sold is -$10 per unit.
d) The rate that profit changes on average when the number of units sold rises from 60 to 120 is -$10 per unit.
e) The number of units sold when profit stops increasing and starts decreasing is approximately 80 units.
a) To find the profit when 60 units are sold, we substitute z = 60 into the profit function P(z). P(60) = -2.5(60)² + 2000(60) - 3000 = $1,000.
b) The average profit per unit is calculated by dividing the profit by the number of units sold. In this case, the average profit per unit when 60 units are sold is $1,000 / 60 = $16.67 per unit.
c) To determine the rate that profit is changing at exactly 60 units, we take the derivative of the profit function with respect to z and evaluate it at z = 60. The derivative of P(z) = -2.5z² + 2000z - 3000 is P'(z) = -5z + 2000. P'(60) = -5(60) + 2000 = -$10 per unit.
d) The rate that profit changes on average when the number of units sold rises from 60 to 120 can be found by subtracting the average profit per unit at 60 units from the average profit per unit at 120 units. Since the rate of change is constant, it is equal to the rate at exactly 60 units, which is -$10 per unit.
e) To determine the number of units sold when profit stops increasing and starts decreasing, we look for the maximum point of the profit function. This occurs at the vertex of the parabola. The x-coordinate of the vertex is given by -b/2a, where a and b are the coefficients of the quadratic equation. In this case, the coefficient of the quadratic term is -2.5, and the coefficient of the linear term is 2000. Therefore, the number of units sold when profit stops increasing and starts decreasing is approximately 80 units (rounded to the nearest whole number).
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Solve the quadratic congruence r² + 3r = 1 mod 19.
Therefore, the quadratic congruence r² + 3r ≡ 1 (mod 19) has no solutions.
To solve the quadratic congruence r² + 3r ≡ 1 (mod 19), we can follow these steps:
Rewrite the congruence in the form r² + 3r - 1 ≡ 0 (mod 19).
Calculate the discriminant: Δ = b² - 4ac, where a = 1, b = 3, and c = -1. We have:
Δ = (3)² - 4(1)(-1)
= 9 + 4
= 13
Determine the Legendre symbol (Δ/19). Since 13 is not a quadratic residue modulo 19, the congruence does not have any solutions.
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Find the values of a and b that make f continuous everywhere. x²-4 if x < 2 X-2 f(x) = 8. [-/6 Points] a b II II ax² - bx + 3 If 2 ≤x<3 4x-a + b if x 2 3
the values of a and b that make the function f continuous everywhere are a = 3 and b = 6.
At x = 2, we have the expression f(x) = x² - 4. To make it continuous at x = 2, we need to find the value of a that makes f(x) = x² - 4 equal to f(x) = ax² - bx + 3. By substituting x = 2 into the equation, we get a(2)² - b(2) + 3 = 2² - 4. Simplifying this equation gives 4a - 2b + 3 = 0.
At x = 3, we have the expression f(x) = 4x - a + b. To make it continuous at x = 3, we need to find the value of b that makes f(x) = 4x - a + b equal to f(x) = ax² - bx + 3. By substituting x = 3 into the equation, we get 4(3) - a + b = 3² - 3b + 3. Simplifying this equation gives 12 - a + b = 6 - 3b + 3.
To find the values of a and b, we can solve these two equations simultaneously. Subtracting the second equation from the first equation gives -a + 2b - 9 = 0. Rearranging this equation, we have a = 2b - 9.
Substituting this expression for a into the second equation, we get 12 - (2b - 9) + b = 6 - 3b + 3. Simplifying this equation gives -b = -6, which implies b = 6.
Substituting the value of b = 6 back into the equation a = 2b - 9, we find a = 2(6) - 9 = 3.
Therefore, the values of a and b that make the function f continuous everywhere are a = 3 and b = 6.
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Prove the following statements using induction
(a) n ∑ i =1(i2 − 1) = (n)(2n2+3n−5)/6 , for all n ≥ 1
(b) 1 + 4 + 7 + 10 + ... + (3n − 2) = n(3n−1)/2 , for any positive integer n ≥ 1
(c) 13n − 1 is a multiple of 12 for n ∈ N (where N is the set of all natural numbers)
(d) 1 + 3 + 5 + ... + (2n − 1) = n2 for all n ≥ 1
The given question is to prove the following statements using induction,
where,
(a) n ∑ i =1(i2 − 1) = (n)(2n2+3n−5)/6 , for all n ≥ 1
(b) 1 + 4 + 7 + 10 + ... + (3n − 2) = n(3n−1)/2 , for any positive integer n ≥ 1
(c) 13n − 1 is a multiple of 12 for n ∈ N (where N is the set of all natural numbers)
(d) 1 + 3 + 5 + ... + (2n − 1) = n2 for all n ≥ 1
Let's prove each statement using mathematical induction as follows:
a) Proof of n ∑ i =1(i2 − 1) = (n)(2n2+3n−5)/6 , for all n ≥ 1 using induction statement:
Base Step:
For n = 1,
the left-hand side (LHS) is 12 – 1 = 0,
and the right-hand side ,(RHS) is (1)(2(12) + 3(1) – 5)/6 = 0.
Hence the statement is true for n = 1.
Assumption:
Suppose that the statement is true for some arbitrary natural number k. That is,n ∑ i =1(i2 − 1) = (k)(2k2+3k−5)/6
InductionStep:
Let's prove the statement is true for n = k + 1,
which is given ask + 1 ∑ i =1(i2 − 1)
We can write this as [(k+1) ∑ i =1(i2 − 1)] + [(k+1)2 – 1]
Now we use the assumption and simplify this expression to get,
(k + 1) ∑ i =1(i2 − 1) = (k)(2k2+3k−5)/6 + [(k+1)2 – 1]
This simplifies to,
(k + 1) ∑ i =1(i2 − 1) = (2k3 + 9k2 + 13k + 6)/6 + [(k2 + 2k)]
This can be simplified as
(k + 1) ∑ i =1(i2 − 1) = (k + 1)(2k2 + 5k + 3)/6
which is the same as
(k + 1)(2(k + 1)2 + 3(k + 1) − 5)/6
Therefore, the statement is true for all n ≥ 1 using induction.
b) Proof of 1 + 4 + 7 + 10 + ... + (3n − 2) = n(3n−1)/2, for any positive integer n ≥ 1 using induction statement:
Base Step:
For n = 1, the left-hand side (LHS) is 1,
and the right-hand side (RHS) is (1(3(1) − 1))/2 = 1.
Hence the statement is true for n = 1.
Assumption:
Assume that the statement is true for some arbitrary natural number k. That is,1 + 4 + 7 + 10 + ... + (3k − 2) = k(3k − 1)/2
Induction Step:
Let's prove the statement is true for n = k + 1,
which is given ask + 1(3k + 1)2This can be simplified as(k + 1)(3k + 1)2 + 3(k + 1) – 5)/2
We can simplify this further(k + 1)(3k + 1)2 + 3(k + 1) – 5)/2 = [(3k2 + 7k + 4)/2] + (3k + 2)
Hence,(k + 1) (3k + 1)2 + 3(k + 1) − 5 = [(3k2 + 10k + 8) + 6k + 4]/2 = (k + 1) (3k + 2)/2
Therefore, the statement is true for all n ≥ 1 using induction.
c) Proof of 13n − 1 is a multiple of 12 for n ∈ N (where N is the set of all natural numbers) using induction statement:
Base Step:
For n = 1, the left-hand side (LHS) is 13(1) – 1 = 12,
which is a multiple of 12. Hence the statement is true for n = 1.
Assumption:
Assume that the statement is true for some arbitrary natural number k. That is, 13k – 1 is a multiple of 12.
Induction Step:
Let's prove the statement is true for n = k + 1,
which is given ask + 1.13(k+1)−1 = 13k + 12We know that 13k – 1 is a multiple of 12 using the assumption.
Hence, 13(k+1)−1 is a multiple of 12.
Therefore, the statement is true for all n ∈ N.
d) Proof of 1 + 3 + 5 + ... + (2n − 1) = n2 for all n ≥ 1 using induction statement:
Base Step:
For n = 1, the left-hand side (LHS) is 1
the right-hand side (RHS) is 12 = 1.
Hence the statement is true for n = 1.
Assumption: Assume that the statement is true for some arbitrary natural number k.
That is,1 + 3 + 5 + ... + (2k − 1) = k2
Induction Step:
Let's prove the statement is true for n = k + 1, which is given as
k + 1.1 + 3 + 5 + ... + (2k − 1) + (2(k+1) − 1) = k2 + 2k + 1 = (k+1)2
Hence, the statement is true for all n ≥ 1.
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Prove that if G is a 3- regular graph with a bridge, then it is not possible to partition G into perfect matchings.
If G is a 3-regular graph with a bridge, it is not possible to partition G into perfect matchings.
To prove that it is not possible to partition a 3-regular graph G with a bridge into perfect matchings, we can use the concept of parity.
A perfect matching in a graph is a set of edges such that every vertex is incident to exactly one edge in the set. In a 3-regular graph, each vertex has a degree of 3, meaning it is incident to three edges.
Now, let's consider the bridge in the 3-regular graph G. A bridge is an edge that, if removed, disconnects the graph into two separate components. Removing a bridge from G will leave two components with an odd number of vertices.
In order to partition G into perfect matchings, each component must have an even number of vertices. This is because in a perfect matching, each vertex is incident to exactly one edge, and for a component with an odd number of vertices, there will be at least one vertex that cannot be matched with another vertex.
Since removing the bridge creates components with an odd number of vertices, it is not possible to partition G into perfect matchings.
Therefore, if G is a 3-regular graph with a bridge, it is not possible to partition G into perfect matchings.
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For fixed z, consider the quantity Q(x, h): = cos(r + h) − cos(r) + h sin(x) h² a) What is the limit (r) of Q(x, h) as h→0? b) What is the optimal value of h> 0 to obtain the best accuracy in Q(x, h) on a computer with machine- epsilon e? What is the accuracy obtained (in terms of €)? c) Plot (r) - Q(x, h)| vs. h (in log-log axes) for 10-16
The optimal value of h for the best accuracy in Q(x, h) on a computer with machine-epsilon e is related to the square root of e, and the accuracy obtained can be expressed in terms of e. Plotting |Q(x, h) - Q(x, 0)| against h in logarithmic axes for small values of h, such as 10^-16, allows us to observe the convergence behavior.
To find the limit of Q(x, h) as h approaches 0, we can use the definition of the derivative. Taking the derivative of cos(r) with respect to r yields -sin(r). Thus, the limit of Q(x, h) as h approaches 0 is -h * sin(r) / h^2 = -sin(r) / h.
For the best accuracy in Q(x, h) on a computer with machine-epsilon e, we want to choose an optimal value of h. This value is related to the square root of e. Specifically, h = √e provides the best balance between accuracy and computational efficiency. The accuracy obtained can be expressed in terms of e, indicating how closely the calculated value of Q(x, h) approximates the true value.
To visualize the convergence behavior, we can plot |Q(x, h) - Q(x, 0)| against h in logarithmic axes for small values of h, such as 10^-16. This plot allows us to observe how the difference between Q(x, h) and the limit Q(x, 0) decreases as h approaches 0. The logarithmic scale is used to better visualize the convergence behavior for very small values of h.
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Consider the difference equation yt+1(a+byt) = cyt, t = 0,1,, where a, b, and c are positive constants, and yo > 0. Show that yt> 0 for all t. b) Define xt = 1/yt. Show that by using this substitution the equation turns into the canonical form. c) Solve the difference equation yt+1(2+3yt) = 4yt, assuming that y₁ = 1/2. What is the limit of y, as t → [infinity]o?
In the given difference equation yt+1(a+byt) = cyt, where a, b, and c are positive constants and yo > 0, we want to show that yt > 0 for all t.
To prove this, we can use mathematical induction.
Base case: For t = 0, we have y0+1(a+by0) = cy0. Since yo > 0, we can substitute yo = xt⁻¹ = 1/y0 into the equation to get x1(a+bx0) = c/x0. Since a, b, and c are positive constants and x0 > 0, it follows that x1(a+bx0) > 0. Therefore, x1 = 1/y1 > 0, which implies that y1 = 1/x1 > 0.
Inductive step: Assume that yt > 0 for some arbitrary positive integer t = k. We want to show that yt+1 > 0. Using the same substitution, we have x(t+1)(a+bx0) = c/xk. Since x(t+1) = 1/yt+1 and xk = 1/yk, we can rewrite the equation as 1/yt+1(a+bx0) = c(1/yk). Since a, b, and c are positive constants and yt > 0 for all t = k, it follows that yt+1 > 0.
Therefore, we have shown by mathematical induction that yt > 0 for all t.
b) By defining xt = 1/yt, we can substitute this into the original difference equation yt+1(a+byt) = cyt. This yields x(t+1)(a+b(1/xt)) = c/xk. Simplifying the equation, we get xt+1 = (c/a)xt - (b/a).
This new equation is in the canonical form, which is a linear recurrence relation of the form xt+1 = px(t) + q, where p and q are constants.
c) For the difference equation yt+1(2+3yt) = 4yt, assuming y₁ = 1/2, we can solve it iteratively.
When t = 0, we have y1(2+3y0) = 4y0. Substituting y0 = 1/2, we get y1(2+3/2) = 2, which simplifies to 5y1 = 4. Therefore, y1 = 4/5.
When t = 1, we have y2(2+3y1) = 4y1. Substituting y1 = 4/5, we get y2(2+3(4/5)) = 4(4/5), which simplifies to 19y2 = 16. Therefore, y2 = 16/19.
Continuing this process, we can find subsequent values of yt. As t approaches infinity, the values of yt converge to a limit. In this case, as t → ∞, the limit of y is y∞ = 4/5.
Therefore, the limit of y as t approaches infinity is 4/5.
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Solve the non-linear Differential Equation y"=-e" : y = f(x) by explicitly following these steps: (Note: u= f(y), w=f(u) so use the chain rule as necessary) iii. (15 pts) Find a Linear DE for the above, solely in variables v and u, by letting y = w², without any rational terms
Given non-linear differential equation: `y"=-e`.To solve the above equation, first we need to find the first derivative of `y`. So, let `u=y'` .
Differentiating both sides of `y"=-e` with respect to `x`, we get: `u' = -e` ...(1)Using the chain rule, `u=y'` and `v=y"`, we get: `v = u dy/dx`Taking the derivative of `u' = -e` with respect to `x`, we get: `v' = u d²y/dx² + (du/dx)²`
Substitute the values of `v`, `u` and `v'` in the above equation, we get: `u d²y/dx² + (du/dx)² = -e` ...(2)
We know that `u = dy/dx` , therefore differentiate both sides of the above equation, we get: `du/dx d²y/dx² + u d³y/dx³ = -e'` ...(3)
We know that `e' = 0`, so substitute the value of `e'` in the above equation, we get: `du/dx d²y/dx² + u d³y/dx³ = 0` ...(4
)
Multiplying both sides of the above equation with `d²y/dx²`, we get: `du/dx d²y/dx² * d²y/dx² + u d³y/dx³ * d²y/dx² = 0` ...(5)
Divide both sides of the above equation by `u² * (d²y/dx²)³`, we get: `du/dx * (1/u²) + d³y/dx³ * (1/d²y/dx²) = 0` ...(6)
Substituting `y = w²`,
we get: `dy/dx = 2w dw/dx`
Differentiating `dy/dx`, we get: `
d²y/dx² = 2(dw/dx)² + 2w d²w/dx²`
Substituting `w=u²`, we get: `dw/dx = 2u du/dx`
Differentiating `dw/dx`, we get: `d²w/dx² = 2du/dx² + 2u d²u/dx²`Substituting the values of `dy/dx`, `d²y/dx²`, `dw/dx` and `d²w/dx²` in the equation `(6)`,
we get: `du/dx * (1/(4u²)) + (2d²u/dx² + 4u du/dx) * (1/(4u²)) = 0`
Simplifying the above equation, we get: `d²u/dx² + u du/dx = 0`This is the required linear differential equation. Therefore, the linear differential equation for the given non-linear differential equation `y" = -e` is `d²u/dx² + u du/dx = 0`.
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When a rocket is two miles high, it is moving vertically upward at a speed of 300 miles per hour. At that instant, how fast is the angle of elevation of the rocket increasing, as seen by an observer on the ground 5 miles from the launching pad?
The angle of elevation, A, as a function of time, t, is given by A(t) = atan((2 + 300t)/5).
To find the angle of elevation, we can use the formula A = atan(y/x), where A represents the angle of elevation, y is the vertical distance to the observer, and x is the horizontal distance to the observer.
In this case, the horizontal distance x is given as 5 miles.
The vertical distance y can be determined using the given function A(t) = atan((2 + 300t)/5), where t represents time.
The solution is find as follows:
The angle of elevation A at time t is given by:
A(t) = atan((2 + 300t)/5)
Therefore, the angle of elevation is obtained by substituting the expression (2 + 300t)/5 into the atan function.
Note: atan is the inverse tangent function, also denoted as arctan or tan⁻¹.
Please note that if you have a specific value for t, you can substitute it into the expression to calculate the angle of elevation at that particular time.
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The angle of elevation, as a function of time, is:
A(t) = Atan( (2 + 300t)/5)
How to find the angle of elevation?The angle of elevation will be given by:
A = Atan(y/x)
Where y is the vertical distance to the observer and x is the horizontal distance to the observer.
We know that x = 5 mi
And y starts at 2mi, and increases by 300 miles per hour, then the angle is given by the expression:
A(t) = Atan( (2 + 300t)/5)
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Use Venn diagrams to answer the two questions below. (a) Show by example that (ANB) UC=AN (BUC) is not an identity. (You need to come up with specific sets, not just a Venn diagram, but a Venn diagram can help you find such sets.) (b) There is an identity of the form (ANB) UC=MON, where M and N are two sets generated from A, B, and C using intersections and/or unions. Use your Venn Diagram to suggest what this identity might be. Hint: Think distributive laws.
(a) By example, demonstrate that (ANB)UC=AN(BUC) is not an identity. (You must provide specific sets, not just a Venn diagram, but a Venn diagram may help you discover such sets.)Solution:
The given question is solved with the help of Venn diagrams, which aids in visualizing the sets and improving comprehension of the same. Here, the Venn diagram is drawn for three sets, A, B, and C, and as a result, the diagram includes eight sections that represent each set and their respective intersections and unions.The shaded section in the figure depicts the regions that contain the elements of (A∩B)U C, AN, and BUC. Then the conclusion may be made that(ANB)UC=AN(BUC) is not an identity.(b) There is an identity of the form (ANB)UC=MON, where M and N are two sets generated from A, B, and C using intersections and/or unions. Use your Venn Diagram to suggest what this identity might be. Hint: Think distributive laws.Solution:Given that (ANB)UC=MON, where M and N are two sets generated from A, B, and C using intersections and/or unions.Let us solve it using distributive law:(ANB)UC= (AUC)NBUC (Distributive law)⇒ AUCNBUC= MON (Given)
Here, the sets M and N can be figured out using the Venn diagram drawn for the sets A, B, and C. According to the distributive rule, M= AUC, and N=BUC. Therefore,(ANB)UC = (AUC)NBUC= (AUC)(BUC) can be considered as an identity.
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Let C c RN such that for all a, b e C there exists a differentiable function g: [0, 1] → C such that g(0) = a, g(1) = b. Let f: C - R be differentiable. a) Let x, y e C. Show that there exists z € C such that f(y)-f(x) = (Vf(z), y - x) b) Show that f is constant if and only if Vf(x) = 0 for all x e C.
a) Therefore, we have shown that there exists z = g(c) in C such that f(y) - f(x) = ⟨Vf(z), y - x⟩. b) Therefore, we have shown that f is constant if and only if Vf(x) = 0 for all x in C.
a) To prove this, we can consider the differentiable function g(t) = x + t(y - x), defined for t in [0, 1]. Since g(0) = x and g(1) = y, by the given condition, there exists a differentiable function h: [0, 1] → C such that h(0) = f(x) and h(1) = f(y). Now, we can define a new function F(t) = ⟨Vf(g(t)), y - x⟩.
Since F is a composition of differentiable functions, F(t) is also differentiable on [0, 1]. Moreover, we have F(0) = ⟨Vf(g(0)), y - x⟩ = ⟨Vf(x), y - x⟩ and F(1) = ⟨Vf(g(1)), y - x⟩ = ⟨Vf(y), y - x⟩. By the Mean Value Theorem for single-variable calculus, there exists c in (0, 1) such that F'(c) = F(1) - F(0) = ⟨Vf(y), y - x⟩ - ⟨Vf(x), y - x⟩ = f(y) - f(x).
Therefore, we have shown that there exists z = g(c) in C such that f(y) - f(x) = ⟨Vf(z), y - x⟩.
b) To show that f is constant if and only if Vf(x) = 0 for all x in C, we can consider the forward and backward implications separately:
Forward implication: If f is constant, then for any x, y in C, we have f(y) - f(x) = 0, which implies ⟨Vf(z), y - x⟩ = 0 for all z in C. This means Vf(z) · (y - x) = 0 for all z in C, and since this holds for arbitrary y - x, we conclude that Vf(z) = 0 for all z in C.
Backward implication: If Vf(x) = 0 for all x in C, then for any x, y in C, we have ⟨Vf(z), y - x⟩ = 0 for all z in C. This implies that f(y) - f(x) = 0, which means f is constant on C.
Therefore, we have shown that f is constant if and only if Vf(x) = 0 for all x in C.
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A manufacturer has been selling 1250 television sets a week at $480 each. A market survey indicates that for each $11 rebate offered to a buyer, the number of sets sold will increase by 110 per week. a) Find the demand function p(z), where is the number of the television sets sold per week. p(z) = b) How large rebate should the company offer to a buyer, in order to maximize its revenue? $ c) If the weekly cost function is 100000+ 160z, how should it set the size of the rebate to maximize its profit? Check Answer Score: 25/300 3/30 answered O Question 28 T Suppose a company's revenue function is given by R(q) =q³+320q² and its cost function is given by 140 + 18g, where q is hundreds of units sold/produced, while R(q) and C(q) are in total dollars of revenue and cost, respectively. C(q) = A) Find a simplified expression for the marginal profit function. (Be sure to use the proper variable in your answer.) MP(q) = B) How many items (in hundreds) need to be sold to maximize profits? Answer: hundred units must be sold. (Round to two decimal places.) Check Answer
The demand function for the television sets is p(z) = 1250 + 110z - 11z². To maximize revenue, the company should offer a rebate of $55. To maximize profit, the company should set the rebate at $27.
a) The demand function represents the relationship between the price of the television sets and the quantity demanded. In this case, the demand function is given by p(z) = 1250 + 110z - 11z², where z is the number of television sets sold per week. The term 1250 represents the initial number of sets sold, and the subsequent terms account for the increase in demand due to the rebate. The coefficient of -11z² indicates that as the rebate increases, the increase in demand will decrease.
b) To maximize revenue, the company needs to find the price that yields the highest total revenue. Total revenue is given by the product of price and quantity. In this case, the revenue function is R(z) = p(z) * (480 - 11z). To find the optimal rebate, the company should differentiate the revenue function with respect to z, set it equal to zero, and solve for z. By calculating the derivative and finding the critical points, we can determine that the optimal rebate should be $55.
c) To maximize profit, the company needs to consider both revenue and cost. The profit function is given by P(z) = R(z) - C(z), where C(z) is the cost function. In this case, the cost function is 100000 + 160z. The marginal profit function, MP(z), is obtained by differentiating the profit function with respect to z. By setting MP(z) equal to zero and solving for z, we can find the quantity of sets that maximizes profit. After calculating the derivative and finding the critical point, we determine that the company should set the rebate at $27 to maximize profit.
Therefore, to maximize revenue, the company should offer a rebate of $55, while to maximize profit, the company should set the rebate at $27.
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All else being equal, if you cut the sample size in half, how does this affect that margin of error when using the sample to make a statistcal inference about the mean of the normally distributed population from which it was drawn
When the sample size is reduced, the margin of error increases, indicating that the estimate of the population mean is less precise and has a wider range of possible values.
When you cut the sample size in half, it has a significant impact on the margin of error when making statistical inferences about the mean of a normally distributed population. The margin of error is a measure of the uncertainty or variability associated with estimating a population parameter based on a sample.
The formula for calculating the margin of error is typically based on the standard deviation of the population, the sample size, and a confidence level. In the case of estimating the population mean, the formula commonly used is:
Margin of Error = Z * (σ / √n)
Where:
Z is the z-score corresponding to the desired confidence level
σ is the standard deviation of the population
n is the sample size
When you cut the sample size in half, the denominator (√n) in the formula decreases. As a result, the margin of error becomes larger.
This occurs because a smaller sample size provides less information about the population, leading to increased uncertainty in the estimate. With fewer data points, it becomes more likely that the sample may not be fully representative of the population, and the estimate may deviate further from the true population mean.
When the sample size is reduced, the margin of error increases, indicating that the estimate of the population mean is less precise and has a wider range of possible values.
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1/5(x)-2/3=4/3
What is the value of x?
Answer:
x = 10
Step-by-step explanation:
[tex]\frac{1}{5}[/tex] x - [tex]\frac{2}{3}[/tex] = [tex]\frac{4}{3}[/tex]
multiply through by 15 ( the LCM of 5 and 3 ) to clear the fractions
3x - 10 = 20 ( add 10 to both sides )
3x = 30 ( divide both sides by 3 )
x = 10
Ace Novelty received an order from Magic World Amusement Park for 900 Giant Pandas, 1200 Saint Bernard, and 2000 Big Birds. a) Ace's Management decided that 500 Giant Pandas, 800 Saint Bernard, and 1300 Big Birds could be manufactured in their Los Angeles Plant, and the balance of the order could be filled by their Seattle Plant. b) Each Panda requires 1.5 square yards of plush, 30 cubic feet of stuffing and 5 pieces of trim; each Saint Bernard requires 2 square yards of plush, 35 cubic feet of stuffing, and 8 pieces of trim; and each Big Bird requires 2.5 square yards of plush, 25 cubic feet of stuffing and 15 pieces of trim. Put this information into a matrix A in such a way that when you multiply it with your matrix from part (a), you get a matrix representing the amount of each type of material required for each plant. [2p]
Matrix A represents the amount of each type of material required for each plant when multiplied with the matrix from part (a).
Let's create a matrix A to represent the amount of each type of material required for each plant.
The columns of matrix A represent the different types of materials (plush, stuffing, trim), and the rows represent the different types of animals (Giant Pandas, Saint Bernard, Big Birds). The entries in the matrix represent the amount of each material required for each animal.
| 1.5 30 5 |
| 2 35 8 |
| 2.5 25 15 |
By multiplying matrix A with the matrix from part (a) (representing the number of animals produced in each plant), we will obtain a matrix representing the amount of each type of material required for each plant.
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Daniela decides to track the snowfall during a snowstorm. Before the storm, she puts a meterstick in the existing snow and tracks the change in the snow's depth over time during two storms.
Keeping track of the snowfall during a snowstorm may be a fun and educational pastime.
Understanding weather patterns, foreseeing risks associated with snow, or just out of fascination.
Data on the snowfall during the storm can be gathered by Daniela.
Daniela can take the following actions to monitor the snowfall:
prior to the storm
Locate an appropriate spot to set the meterstick. It ought to be in a wide open space, far from any trees or structures that can hinder snow accumulation.
Make sure the meterstick is firm and straight as you insert it vertically into the snow that is already there. Take note of the meterstick's initial depth reading.
Throughout the storm
Check the meterstick frequently to gauge changes in snow depth. It's ideal to set up a regular interval for recording the measures, like once an hour.
At the same spot on the meterstick, measure the new depth of snow using a ruler or measuring tape. To calculate the change in snow depth, subtract the initial depth that was earlier noted.
For each measurement, note the date and related snow depth.
following a storm
Daniela can check the information gathered and examine the snowfall pattern once the storm has passed.
By adding together the observed variations in snow depth, she can determine the overall snowfall.
If she so chooses, Daniela might examine any variations in snowfall patterns between the two storms by comparing the data from the two storms.
In order to get more complete information, Daniela may also think about taking additional weather-related measurements throughout the storm, such as the temperature or wind speed. This can give a more comprehensive understanding of the weather patterns and how they affect snow accumulation.
Always put safety first when performing these tasks. Stay indoors and watch the storm from a secure spot if the weather turns dangerous or if it's unsafe to be outside.
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(a) Determine the general solution of the differential equation y' y" = x cos 7x. x (Hint: Set v=y' and solve the resulting linear differential equation for v = = v(x).) (b) (i) Given that -1 + 4i is a complex root of the cubic polynomial x³ + 13x - 34, determine the other two roots (without using a calculator). (ii) Hence, (and without using a calculator) determine 25 √7³ +13x -34° dx. (Hint: Use the result of part (a) to write x³ + 13x - 34= (x − a) (x²+bx+c) for some a, b and c, and use partial fractions.)
(a) The general solution of the differential equation y' y" = x cos 7x is y(x) = C₁ + C₂∫(e^(-v^2/2) / v) dv, where C₁ and C₂ are constants.
(b) (i) The other two roots of the cubic polynomial x³ + 13x - 34, given that -1 + 4i is a complex root, can be determined using the conjugate root theorem. The roots are -1 + 4i, -1 - 4i, and 2.
(ii) To evaluate the integral 25 √7³ + 13x - 34° dx, we can use the result from part (a) to decompose the polynomial into its factors. The polynomial x³ + 13x - 34 can be factored as (x + 1 - 4i)(x + 1 + 4i)(x - 2). By applying partial fractions, we can integrate each term separately to find the final result.
(a) To solve the differential equation y' y" = x cos 7x, we can substitute v = y' and rewrite the equation as v dv = x cos 7x dx. Integrating both sides gives us v²/2 = ∫(x cos 7x) dx. Solving this integral yields v²/2 = (1/98)(7x sin 7x - cos 7x) + C, where C is a constant. Rearranging the equation gives us v(x) = ±√(2/98)(7x sin 7x - cos 7x + 98C). Integrating v(x) with respect to x gives y(x) = C₁ + C₂∫(e^(-v^2/2) / v) dv, where C₁ and C₂ are constants.
(b) (i) Given that -1 + 4i is a complex root of the cubic polynomial x³ + 13x - 34, we can use the conjugate root theorem to find the other two roots. Since complex roots occur in conjugate pairs, the other complex root is -1 - 4i. To find the remaining real root, we divide the cubic polynomial by the quadratic factor (x + 1 - 4i)(x + 1 + 4i). The resulting quadratic factor is x - 2, which gives us the real root 2.
(ii) To evaluate the integral 25 √7³ + 13x - 34° dx, we can rewrite the cubic polynomial x³ + 13x - 34 as (x + 1 - 4i)(x + 1 + 4i)(x - 2) using the roots found in part (b)(i). We can then decompose the integrand using partial fractions, expressing it as A/(x + 1 - 4i) + B/(x + 1 + 4i) + C/(x - 2), where A, B, and C are constants. Integrating each term separately will give us the result of the integral. However, since the integral involves complex roots, the evaluation of the integral without a calculator may require more extensive algebraic manipulations.
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Is this positive , or negative or zero
write the equation for the vertical and horizontal line (-1.5,-3.5).
The equation for the vertical line passing through the point (-1.5, -3.5) is x = -1.5. The equation for the horizontal line passing through the same point is y = -3.5.
The equation for a vertical line can be written as x = a, where "a" is the x-coordinate of any point on the line. In this case, since the line passes through the point (-1.5, -3.5), the equation for the vertical line is x = -1.5.
Similarly, the equation for a horizontal line can be written as y = b, where "b" is the y-coordinate of any point on the line. Since the given point is (-1.5, -3.5), the equation for the horizontal line is y = -3.5.
In both equations, the values of x and y are fixed and do not change as the variable on the other side of the equation varies. Therefore, the equations represent lines that are vertical and horizontal respectively. The slope of a vertical line is undefined, and the slope of a horizontal line is zero.
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Using a suitable linearization to approximate √101, show that (i) The approximate value is 10.05. (ii) The error is at most 1 4000 0.00025. That is √101 € (10.04975, 10.05025). =
Linearization is the process of approximating a nonlinear equation or function by means of a straight line.
Linearization makes solving equations, estimating data points, and developing relationships between variables much easier.
Let's find the solution to the given problem.
Statement (i)To begin with, we will need to compute the linearization of the square root function, which is given by
f(x) = √101 + (x - 101)/(2√101)
And we need to find the value of f(100), so the linearized function is
f(100) = f(101 - 1)
≈ f(101) - f'(101)
≈ √101 + (101 - 101)/(2√101)
= √101
The value of √101 is 10.0498756211, which is very close to the estimated value of 10.05.
This is within the range of acceptable error, and we can therefore proceed to the second stage of the problem.
Statement (ii)The error is calculated using the formula given below:
Error = |f(x) - L(x)|,
where L(x) is the linearization of f(x) at x = a.
We can plug in the values we have to get the maximum error:
Error = |√101 - √101|/(2√101) = 1/(2√101) = 0.00012564
The maximum error is 0.00012564, which is less than 1/4000, or 0.00025.
The linearization approximation is therefore accurate.
Finally, we can conclude that √101 € (10.04975, 10.05025).
Therefore, the answer is (i) The approximate value is 10.05 and (ii) the error is at most 1/4000 = 0.00025.
That is √101 € (10.04975, 10.05025).
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Find the centre of mass for a cylinder, centre the z-axis, radius 2 m, height 3 m, with its base on the x-y plane, with volume density p= kz +y² ट+
The center of mass for a cylinder with a radius of 2 m and a height of 3 m, and volume density given by [tex]$p = kz + y^2$[/tex], is located at the coordinates [tex]$(0, 0, \frac{2.25}{k})$[/tex].
To find the center of mass, we need to determine the coordinates [tex]$(x_{\text{cm}}, y_{\text{cm}}, z_{\text{cm}})$[/tex] where the mass of the cylinder is evenly distributed. Since the cylinder is symmetric about the z-axis and its base is on the x-y plane, the x and y coordinates of the center of mass will be zero.
To find the z-coordinate, we need to calculate the average value of z over the volume of the cylinder. The volume density is given by [tex]$p = kz + y^2$[/tex], where k is a constant.
To determine the average value of z, we integrate the volume density over the volume of the cylinder and divide by the total volume. Since the cylinder is centered along the z-axis, the integration limits for z are [tex]$-\frac{h}{2}$[/tex] to [tex]$\frac{h}{2}$[/tex], where h is the height of the cylinder.
The total volume of the cylinder is given by [tex]$V = \pi r^2 h = \pi (2^2)(3) = 12\pi$[/tex].
Using the formula for the average value of a function, we have:
[tex]\[z_{\text{cm}} = \frac{1}{V} \int_{-\frac{h}{2}}^{\frac{h}{2}} \int_{-\sqrt{r^2-x^2}}^{\sqrt{r^2-x^2}} \int_{-\frac{h}{2}}^{\frac{h}{2}} (kz + y^2) \,dz\,dy\,dx.\][/tex]
Since the cylinder is symmetric, the integration over y and x will give zero for the second term. Thus, we are left with:
[tex]\[z_{\text{cm}} = \frac{1}{V} k \int_{-\frac{h}{2}}^{\frac{h}{2}} \int_{-\sqrt{r^2-x^2}}^{\sqrt{r^2-x^2}} \int_{-\frac{h}{2}}^{\frac{h}{2}} z \,dz\,dy\,dx.\][/tex]
Evaluating this triple integral over the volume of the cylinder, we find:
[tex]\[z_{\text{cm}} = \frac{1}{12\pi} k \cdot 2.25.\][/tex]
Therefore, the center of mass is located at the coordinates [tex]$(0, 0, \frac{2.25}{k})$[/tex].
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Use the Euclidean algorithm to find ged(707, 413), and find integers s, t such that 707s + 413t = gcd (707,413). (b) Are there integers x, y such that 707x +413y = 9? If there are, give an example. If there are no such r, y, then prove it.
a) Using the Euclidean algorithm, we can find gcd (707,413) as follows:707 = 1 · 413 + 294413 = 1 · 294 + 119294 = 2 · 119 + 562119 = 2 · 56 + 71356 = 4 · 71 + 12 71 = 5 · 12 + 11 12 = 1 · 11 + 1
Thus, gcd (707,413) = 1.
We can find the coefficients s and t that solve the equation 707s + 413t
= 1 as follows:1 = 12 - 11 = 12 - (71 - 5 · 12) = 6 · 12 - 71 = 6 · (119 - 2 · 56) - 71
= - 12 · 56 + 6 · 119 - 71
= - 12 · 56 + 6 · (294 - 2 · 119) - 71 = 18 · 119 - 12 · 294 - 71
= 18 · 119 - 12 · (413 - 294) - 71 = 30 · 119 - 12 · 413 - 71
= 30 · (707 - 1 · 413) - 12 · 413 - 71 = 30 · 707 - 42 · 413 - 71
Thus, s = 30, t = -42. So we have found that 707(30) + 413(−42) = 1.
b) Since 707s + 413t = 1 and 9 does not divide 1, the equation 707x + 413y = 9 has no integer solutions. Therefore, we can conclude that there are no such integers x and y.
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$ 6 (-e)" Identify: bn = hel Evaluate lim bn = nyoo compute dbn=
To find the derivative, d(b_n), we differentiate b_n with respect to n. The derivative of b_n is given by d(b_n) = -h * e^(-n).
The sequence b_n = h * e^(-n) involves the exponential function with a negative exponent. As n increases, the exponent (-n) tends to negative infinity, and the exponential term e^(-n) approaches zero. This causes the entire sequence b_n to converge towards zero. Therefore, the limit of b_n as n approaches infinity, lim b_n, is equal to zero.
To find the derivative, d(b_n), we differentiate b_n with respect to n. The derivative of h * e^(-n) with respect to n is obtained using the chain rule of differentiation. The derivative of e^(-n) is -e^(-n), and multiplying it by h gives us the derivative of b_n:
d(b_n) = -h * e^(-n).
Thus, the derivative of b_n is -h * e^(-n).
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On a large college campus, 35% of the students own a car, 20% of the students own a truck, and 45% of the students do not own a car or a truck. No student owns both a car or a truck. Two students are randomly selected. What is the probability that both students own a truck? Enter your answer using two decimal places,
Answer:
P(both students own a truck)
= .2(.2) = .04 = 4%
The probability that both students own a truck is 0.04 or 4% (rounded to two decimal places).
How to determine the probability that both students own a truckLet's calculate the probability that both students own a truck.
Given:
P(Own a car) = 35% = 0.35
P(Own a truck) = 20% = 0.20
P(Own neither car nor truck) = 45% = 0.45
We know that no student owns both a car and a truck, so the events "owning a car" and "owning a truck" are mutually exclusive.
The probability that both students own a truck can be calculated by multiplying the probability of the first student owning a truck by the probability of the second student owning a truck. Since the events are independent, we multiply the probabilities:
P(Both students own a truck) = P(Own a truck for student 1) * P(Own a truck for student 2)
= 0.20 * 0.20
= 0.04
Therefore, the probability that both students own a truck is 0.04 or 4% (rounded to two decimal places).
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Integration of algebraic expression. 1. f(4x³ - 3x² +6x-1) dx 2. √(x^² - 1/2 x ² + 1 + x - 2) dx 4 2 5 3. √ ( ²7/3 + 23²323 - 12/3 + 4 ) d x x³ 2x³ x² 2 4. S (√x³ + √x²) dx 5.f5x²(x³ +2) dx
The integration of the given algebraic expressions are as follows:
∫(4x³ - 3x² + 6x - 1) dx, ∫√(x² - 1/2 x² + 1 + x - 2) dx, ∫√(7/3 + 23²323 - 12/3 + 4) dx, ∫(√x³ + √x²) dx, ∫5x²(x³ + 2) dx
To integrate 4x³ - 3x² + 6x - 1, we apply the power rule and the constant rule for integration. The integral becomes (4/4)x⁴ - (3/3)x³ + (6/2)x² - x + C, where C is the constant of integration.
To integrate √(x² - 1/2 x² + 1 + x - 2), we simplify the expression under the square root, which becomes √(x² + x - 1). Then, we apply the power rule for integration, and the integral becomes (2/3)(x² + x - 1)^(3/2) + C.
To integrate √(7/3 + 23²323 - 12/3 + 4), we simplify the expression under the square root. The integral becomes √(23²323 + 4) + C.
To integrate √x³ + √x², we use the power rule for integration. The integral becomes (2/5)x^(5/2) + (2/3)x^(3/2) + C.
To integrate 5x²(x³ + 2), we use the power rule and the constant rule for integration. The integral becomes (5/6)x⁶ + (10/3)x³ + C.
Therefore, the integration of the given algebraic expressions are as mentioned above.
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Let p=0.35 be the proportion of smart phone owners who have a given app. For a particular smart phone owner, let x = 1 if they have the app and x = 0 otherwise. State the population distribution (that is, the probability distribution of X for each observation).
This distribution shows that there is a 35% probability that a randomly selected smartphone owner has the given app (X = 1), and a 65% probability that they do not have the app (X = 0).
Based on the information provided, the population distribution for the random variable X can be defined as follows:
X = 1 with probability p = 0.35 (smartphone owners who have the given app)
X = 0 with probability 1 - p = 1 - 0.35 = 0.65 (smartphone owners who do not have the given app)
Therefore, the population distribution of X is as follows:
X | Probability
--------------
1 | 0.35
0 | 0.65
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Which ordered pair would form a proportional relationship with the point graphed below? On a coordinate plane, a line goes through points (0, 0) and (45, 30). (10, 10) (25, 35) (70, 50) (90, 60)
valuate the following integral. x² - 6x +9 dx (16+6x-x²) 3/2 Rewrite the integrand by completing the square. (x-3)² x² - 6x +9 (16+6x-x²) ³/2 dx= dx (Simplify your answer.)
To evaluate the given integral, we can rewrite the integrand by completing the square as [tex](x - 3)^2(16 + 6x - x^2)^{(3/2)} dx[/tex] and simplifying it further.
The given integral is [tex]\int(x^2- 6x + 9)(16 + 6x - x^2)^{(3/2)} dx[/tex]. We can simplify the integrand by completing the square.
First, let's rewrite the integrand as [tex](x - 3)^2(16 + 6x - x^2)^{(3/2)} dx[/tex]. We complete the square by factoring out the perfect square term (x - 3)² from the expression x² - 6x + 9.
Now, the integrand becomes [tex](x - 3)^2(16 + 6x - x^2)^{(3/2)} dx[/tex].
To simplify further, we can use substitution or expand the expression and integrate each term separately. However, without additional information or constraints, we cannot simplify the expression any further or provide an exact value for the integral.
Therefore, the simplified form of the integral is [tex]\int(x - 3)^2(16 + 6x - x^2)^{(3/2)} dx[/tex], and further evaluation or simplification would require additional steps or constraints.
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The fundamental solution for the Laplace operator L = A in R² is Þ(x, y) 1 2π log |x - y, (5.1) where x = (x₁, x₂) and y = (y₁, y2) are two points in R² satisfying x ‡ y. (A) We fix y E R². Show that is harmonic with respect to x = (x₁, x2) in the region R² \ {y}. [5 marks]
Hence, we have shown that Φ(x, y) = 1/(2π) log|x - y| is a harmonic function with respect to x = (x₁, x₂) in the region R² \ {y}.
To show that the function Φ(x, y) = 1/(2π) log|x - y| is harmonic with respect to x = (x₁, x₂) in the region R² \ {y}, we need to demonstrate that it satisfies Laplace's equation:
∂²Φ/∂x₁² + ∂²Φ/∂x₂² = 0
Let's calculate the second derivatives of Φ with respect to x₁ and x₂:
∂Φ/∂x₁ = 1/(2π) * 1/(x₁ - y₁)
∂²Φ/∂x₁² = -1/(2π) * 1/(x₁ - y₁)²
∂Φ/∂x₂ = 1/(2π) * 1/(x₂ - y₂)
∂²Φ/∂x₂² = -1/(2π) * 1/(x₂ - y₂)²
Now, let's add the second derivatives:
∂²Φ/∂x₁² + ∂²Φ/∂x₂² = -1/(2π) * 1/(x₁ - y₁)² - 1/(2π) * 1/(x₂ - y₂)²
To simplify this expression, we can use the property that log(ab) = log(a) + log(b):
∂²Φ/∂x₁² + ∂²Φ/∂x₂² = -1/(2π) * (1/(x₁ - y₁)² + 1/(x₂ - y₂)²)
= -1/(2π) * (1/((x₁ - y₁)(x₂ - y₂)))
Since x ≠ y, the denominator (x₁ - y₁)(x₂ - y₂) ≠ 0, so we can divide both sides by this term:
∂²Φ/∂x₁² + ∂²Φ/∂x₂² = 0
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Every function f defined on (-[infinity]o, co) that satisfies the condition that lim f(x) = lim f(x) = [infinity]o must have at least x18 x118 one critical point. True False (f) The function f(x)=√x is differentiable at x = 0. True False (g) The function f(x) = |x| is not continuous at x = 0. True False
We can answer the questions on functions in this way:
(a) Every function f defined on (-∞, ∞) that satisfies the condition that lim f(x) = lim f(x) = ∞ must have at least one critical point is false.
(b) The function f(x) = √x is differentiable at x = 0 is false.
(c) The function f(x) = |x| is not continuous at x = 0 is false.
How to analyze statements according to the functions.(a) Every function f defined on (-∞, ∞) that satisfies the condition that lim f(x) = lim f(x) = ∞ must have at least one critical point.
A function can have a limit of infinity at every point without having a critical point.
For example, the function f(x) = x² does not have any critical points, but it approaches infinity as x goes to positive or negative infinity.
Thus, this statement is false.
(b) The function f(x) = √x is differentiable at x = 0.
The derivative of f(x) = √x is undefined at x = 0 because the slope of the tangent line is not defined for a square root function at x = 0.
So, the function f(x) = √x is not differentiable at x = 0, is a false statement.
(c) The function f(x) = |x| is not continuous at x = 0.
The absolute value function |x| has a well-defined value at x = 0, and the left and right limits of f(x) as x approaches 0 exist and are equal.
So, the function f(x) = |x| is a continuous function at x = 0.
Hence, this statement is also false.
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For which values of a and does the following system of equations have a) Unique solution? 5) Infinitely many solutions? c) No solution?
An values of a and does the following system of equations
a) Unique solution: ad - bc ≠ 0
b) Infinitely many solutions: ad - bc = 0 and (c/e) = (f/b)
c) No solution: ad - bc = 0 and (c/e) ≠ (f/b)
To determine the number of solutions for a system of equations, to examine the coefficients of the variables and the constant terms denote the system of equations as:
Equation 1: ax + by = c
Equation 2: dx + ey = f
a) Unique Solution:
The system of equations has a unique solution if the determinant of the coefficient matrix (ad - bc) is nonzero.
If ad - bc ≠ 0, then the system has a unique solution for any values of a and b.
b) Infinitely Many Solutions:
The system of equations has infinitely many solutions if the determinant of the coefficient matrix (ad - bc) equals zero, and the constant terms (c and f) satisfy certain conditions.
If ad - bc = 0 and (c/e) = (f/b), then the system has infinitely many solutions.
c) No Solution:
The system of equations has no solution if the determinant of the coefficient matrix (ad - bc) equals zero, and the constant terms (c and f) do not satisfy the conditions for infinitely many solutions.
If ad - bc = 0 and (c/e) ≠ (f/b), then the system has no solution.
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