The numbers of students enrolled in different courses of a college are given below: Commercial Studies: 60 Computer Studies: 50 Health Services: 150 Catering Services: 140 If 40 students are selected by stratified random sampling, find the number of total students and the number of students selected in each stratum.

Given w = x²y² + yz - z³ and x² + y² + z² = 22, we have to find w ду X and Əw ду at the point (w, x, y, z)

= (54, − 2,3, − 3).

w ду X = 2xy² + z and Əw ду = (2xy² + z, 2x²y + 1, 2yz - 3z², x² + 2y + 2z)

Given w = x²y² + yz - z³ and x² + y² + z² = 22

Differentiating w = x²y² + yz - z³

with respect to x, we get:

w ду X = 2xy² + z

Differentiating w = x²y² + yz - z³

with respect to x, y, and z, we get:

Əw ду = (2xy² + z, 2x²y + 1, 2yz - 3z², x² + 2y + 2z)

Putting (w, x, y, z) = (54, − 2,3, − 3) in the above equations, we get:

w ду X = -36 and Əw ду = (-36, -23, -21, 19)

Therefore, w ду X is -36 and Əw ду is (-36, -23, -21, 19).

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Using the distributive property of multiplication over addition, we can rewrite the expression as follows: \[ 68 \times 97+68 \times 3= 68 \times (97+3) . \]

Simplifying the expression inside the parentheses, we get \[ 68 \times (97+3) = 68 \times 100 . \] Multiplying 68 by 100 gives us a final result of \[ 68 \times 100 = 6800 . \] So, \(68 \times 97+68 \times 3 = 6800\).

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The perimeter of the triangle is [tex]12\sqrt{2} + 4\sqrt{6}[/tex] units, obtained by adding the lengths of the two legs ([tex]4\sqrt{2}\ and\ 4\sqrt{6}[/tex]) and the hypotenuse ([tex]8\sqrt{2}[/tex]).

To find the perimeter of the right triangle, we need to add the lengths of all three sides. Given that the two legs of the triangle are 4√2 and 4√6 units long, we can calculate the perimeter.

The perimeter is given by the formula: [tex]Perimeter = leg_1 + leg_2 + hypotenuse[/tex]

In this case, the hypotenuse is the longest side of the right triangle, and it can be calculated using the Pythagorean theorem:

[tex]hypotenuse^2 = leg_1^2 + leg_2^2[/tex]

Squaring the lengths of the legs, we have:

[tex](4\sqrt{2} )^2 + (4\sqrt{6})^2 = 16 * 2 + 16 * 6 = 32 + 96 = 128[/tex]

Taking the square root of 128, we get the length of the hypotenuse:

[tex]hypotenuse = \sqrt{128} = 8\sqrt{2}[/tex]

Now, we can calculate the perimeter:

[tex]Perimeter = 4\sqrt{2} + 4\sqrt{6} + 8\sqrt{2}[/tex]

Combining like terms, we get:

[tex]Perimeter = 12\sqrt{2} + 4\sqrt{6}[/tex]

Therefore, the perimeter of the triangle is [tex]12\sqrt{2} + 4\sqrt{6}[/tex] units.

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The glacier will advance approximately 3066 feet in one year, rounding to the nearest hundred.

To determine how many feet the glacier will advance in one year, we need to convert the given measurement from inches per minute to feet per year using dimensional analysis.

First, we convert inches to feet:

1 foot = 12 inches

Next, we convert minutes to years:

1 year = 365 days

1 day = 24 hours

1 hour = 60 minutes

Now we can set up the dimensional analysis:

(2.8 inches) × (1 foot / 12 inches) × (60 minutes / 1 hour) × (24 hours / 1 day) × (365 days / 1 year)

Simplifying the fractions, we get:

(2.8 / 12) feet per minute × (60 × 24 × 365) minutes per year

Calculating the result:

(2.8 / 12) × (60 × 24 × 365) = 3066 feet per year

Therefore, the glacier will advance approximately 3066 feet in one year, rounding to the nearest hundred.

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The transient solution is uc(t) = 5e^(-2t)cos(3t) + 2e^(-2t)sin(3t), and the steady-state solution is U = 10sin(t) - 5cos(t).

To determine the transient solution, uc(t), and the steady-state solution, U, of the given motion equation, we need to identify the exponential terms in the equation. The exponential terms represent the transient behavior, while the remaining terms contribute to the steady-state behavior.

Let's break down the given equation:

u(t) = 10sin(t) - 5cos(t) + 5e^(-2t)cos(3t) + 2e^(-2t)sin(3t)

The exponential terms are:
5e^(-2t)cos(3t) and 2e^(-2t)sin(3t)

The transient solution, uc(t), will only consist of the exponential terms. Thus, the transient solution is:

uc(t) = 5e^(-2t)cos(3t) + 2e^(-2t)sin(3t)

On the other hand, the steady-state solution, U, will be composed of the remaining terms in the equation:

U = 10sin(t) - 5cos(t)

Therefore, the transient solution is uc(t) = 5e^(-2t)cos(3t) + 2e^(-2t)sin(3t), and the steady-state solution is U = 10sin(t) - 5cos(t).

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The solution to the given function is g∘f−1∘f(x) = x^2 + 1.

The following are the evaluations of

g∘f(x), f∘g(x), h∘g∘f(x), g∘h∘f(x), g∘f−1∘f(x), and f−1∘g∘f(x)

where f(x) = x + 2, g(x) = (x^2 + 1)/(1) and h(x) = 3.g∘f(x)

First, we have to calculate g(f(x)):g(f(x)) = g(x + 2)

Substitute x + 2 into g(x): g(x + 2) = (x + 2)^2 + 1

Then: g(f(x)) = (x + 2)^2 + 1f∘g(x)

First, we have to calculate f(g(x)): f(g(x)) = f[(x^2 + 1)/1]

Substitute (x^2 + 1)/1 into f(x): f[(x^2 + 1)/1] = (x^2 + 1)/1 + 2

Then: f(g(x)) = x^2 + 3h∘g∘f(x)

First, we have to calculate g(f(x)): g(f(x)) = g(x + 2)

Substitute x + 2 into g(x): g(x + 2) = (x + 2)^2 + 1

Now we have to calculate h[g(f(x))]:h[g(f(x))] = h[(x + 2)^2 + 1]

Substitute [(x + 2)^2 + 1] into h(x): h[(x + 2)^2 + 1] = 3

Then: h[g(f(x))] = 3g∘h∘f(x)

First, we have to calculate f(x): f(x) = x + 2

Now we have to calculate h[f(x)]: h[f(x)] = h(x + 2)

Substitute x + 2 into h(x): h(x + 2) = 3

Now we have to calculate g[h[f(x)]]: g[h[f(x)]] = g[3]

Substitute 3 into g(x): (3^2 + 1)/1 = 10

Therefore: g[h[f(x)]] = 10g∘f−1∘f(x)

We have to calculate f−1(x): f(x) = x + 2

If we solve this for x, we get: x = f−1(x) − 2

Now we have to calculate f−1(f(x)): f−1(f(x)) = f−1(x + 2)

Substitute x + 2 into f(x): f−1(x + 2) = x + 2 − 2

Then: f−1(f(x)) = xg∘f−1∘f(x)

We have to calculate f−1(x): f(x) = x + 2

If we solve this for x, we get: x = f−1(x) − 2

Now we have to calculate g[f−1(x)]: g[f−1(x)] = [f−1(x)]^2 + 1

Substitute x into f−1(x): g[f−1(x)] = [(x + 2) − 2]^2 + 1

Then: g[f−1(x)] = x^2 + 1

Therefore, g∘f−1∘f(x) = x^2 + 1

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The parametric equation for the tangent line at t = 0 is:

[tex]x = 0 + (1/2)t\\y = 1\\z = 1 + (1/2)t[/tex]

To find the tangent vector to the path at t = 0, we need to differentiate each component of the path with respect to t and evaluate it at t = 0.

Given the path c(t) = (sin(2t), cos(3t), 2sin(t) + cos(t)), we can differentiate each component as follows:

[tex]x'(t) = d/dt[\sin(2t)] \\= 2cos(2t)\\y'(t) = d/dt[\cos(3t)] \\= -3sin(3t)\\z'(t) = d/dt[2\sin(t) + cos(t)] \\= 2cos(t) - sin(t)[/tex]

Now we can evaluate these derivatives at t = 0:

[tex]x'(0) = 2\cos(0) = 2(1) \\= 2\\y'(0) = -3\sin(0) \\= 0\\z'(0) = 2\cos(0) - \sin(0) \\= 2(1) - 0 \\= 2[/tex]

Therefore, the tangent vector to the path at t = 0 is (2, 0, 2).

To find the parametric equation for the tangent line to the path at t = 0, we can use the point-slope form of a line. We already have the point (x0, y0, z0) = (sin(2(0)), cos(3(0)), 2sin(0) + cos(0)) = (0, 1, 1).

The equation of the tangent line is given by:

x - x0 y - y0 z - z0

------- = -------- = --------

a b c

Substituting the values we have:

x - 0 y - 1 z - 1

----- = ------- = -----

2 0 2

Simplifying, we get:

x y - 1 z - 1

--- = ------- = -----

2 0 2

The parametric equation for the tangent line at t = 0 is:

[tex]x = 0 + (1/2)t\\y = 1\\z = 1 + (1/2)t[/tex]

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The tangent vector to this path at t=0 is (2, 0, 2) and the parametric equation for the tangent line to this path is;

r(t) = (2t, 1, 1 + 2t).

Given path is c(t) = (sin(2t),

cos(3t), 2sint + cost).

(a) The tangent vector to this path at t=0 is:

To find the tangent vector at t = 0, find the derivative of c(t) and substitute t = 0.

c(t) = (sin(2t),

cos(3t), 2sint + cost)

Differentiate with respect to t

c'(t) = (2cos(2t), -3sin(3t), 2cost-sint)

The tangent vector at t = 0 is c'(0) = (2cos(0), -3sin(0),

2cos(0)-sin(0)) = (2, 0, 2).

(b) The parametric equation for the tangent line to this path at t=0 is:

The equation of a line is given by y = mx + b, where m is the slope and b is the y-intercept.

Here, the slope is the tangent vector we found in part (a), and the point (sin(0), cos(0), 2sin(0) + cos(0)) = (0, 1, 1) lies on the line. So, the parametric equation for the tangent line to this path at t=0 is:

r(t) = (0, 1, 1) + t(2, 0, 2)

= (2t, 1, 1 + 2t).

Conclusion: Therefore, the tangent vector to this path at t=0 is (2, 0, 2) and the parametric equation for the tangent line to this path is;

r(t) = (2t, 1, 1 + 2t).

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Let's denote the given polynomial by f(x).

We are given that x + 1 is a factor of f(x).

Thus x = -1 is a root of f(x).

[tex]Hence substituting x = -1 in f(x), we get:6(-1)² + m² + n(-1) - 5 = 0m - n = 11--------------(1)[/tex]

[tex]Now, when f(x) is divided by (x - 1), the remainder is -4.[/tex]

[tex]Hence we have f(1) = -4Hence 6(1)² + m² + n(1) - 5 = -4m + n = 9[/tex]----------------(2)

[tex]Solving equations (1) and (2) by adding them, we get:2m = 20m = 10[/tex]

[tex]Substituting m = 10 in equation (1), we get:n = 11 + m = 11 + 10 = 21[/tex]

Hence m = 10 and n = 21.

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The polynomial 6x² + m² +nx-5 has a factor of x + 1. When divided by x-1, the remainder is -4. What are the values of m and n:

m = -9/7

n = 32/49

To find the values of m and n, we can use the factor theorem and the remainder theorem.

According to the factor theorem, if x + 1 is a factor of the polynomial, then (-1) should be a root of the polynomial. Let's substitute x = -1 into the polynomial and solve for m and n:

6x² + m² + nx - 5 = 0

When x = -1:

6(-1)² + m² + n(-1) - 5 = 0

6 + m² - n - 5 = 0

m² - n + 1 = 0  ... Equation 1

Next, we'll use the remainder theorem. According to the remainder theorem, if x - 1 is a factor of the polynomial, then when we divide the polynomial by x - 1, the remainder should be equal to -4. Let's perform the division:

        6x + (m² + n + 1)

x - 1  ________________________

        6x² + (m² + n + 1)x - 5

       - (6x² - 6x)

       _______________

                7x + 5

Since the remainder is -4, we have:

7x + 5 = -4

Solving this equation for x, we get x = -9/7.

Now, substituting x = -9/7 into Equation 1 to solve for m and n:

(m² - n + 1) = 0

(m² - n + 1) = 0

(-9/7)² - n + 1 = 0

81/49 - n + 1 = 0

n - 81/49 = -1

n = 81/49 - 1

n = 81/49 - 49/49

n = (81 - 49)/49

n = 32/49

Therefore, the values of m and n are:

m = -9/7

n = 32/49

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The critical value for the upper tail area of 2.5% is approximately 12.592, and the critical value for the lower tail area of 2.5% is approximately 2.204 when using the chi-square distribution with 6 degrees of freedom.

To find the critical values for a 95% confidence interval using the chi-square distribution, we need to determine the values of chi-square that correspond to the upper and lower tail areas of 2.5% each.

Since we have 6 degrees of freedom, we can refer to a chi-square distribution table or use a statistical software to find the critical values.

The critical value for the upper tail area of 2.5% can be denoted as χ²(0.025, 6), and the critical value for the lower tail area of 2.5% can be denoted as χ²(0.975, 6).

Using a chi-square distribution table or a calculator, the critical values are approximately:

χ²(0.025, 6) ≈ 12.592

χ²(0.975, 6) ≈ 2.204

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The formula for the area K of the triangle is K = 2ab sin(C). Option C is the answer

A triangle can be defined as a polygon that has three sides. The three sides can be equal or unequal giving rise to different type of triangle.

The appropriate formula for the area K of a triangle with angles A, B, C and opposite sides a, b, and c respectively, is

K = (1/2) a b sin(C)

= (1/2) b c sin(A)

= (1/2) c a sin(B)

By rewriting the the formula in terms of just two sides

K = (1/2) a b sin(C)

By rearranging the expression

We have;

K = (1/2) c a sin(B)

= (1/2) ab sin(C)/sin(B)

= 2ab sin(C)/(2sin(B))

= 2ab sin(C)/2b

= a sin(C)

Hence, option C  which is is the correct formula

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An NPV profile graphs a project's NPV over a range of discount rates. Therefore, the correct option is C.

An NPV profile is a graph of a project's NPV over a range of discount rates. It's a valuable financial modeling and capital budgeting tool that allows managers to view the relationship between an investment's NPV and the cost of capital.

Discount rates are the most significant driver of NPV since they represent the project's cost of capital, i.e., the expense of obtaining funding to complete the project. To better understand the sensitivity of a project's NPV to shifts in the discount rate, NPV profiles are often utilized.

Therefore, c is correct.

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a. P(Y = 0|X = 0) = P(drawing a black ball from 6 black and 4 white balls) = 6/10 = 3/5If we draw a white ball, then Y = 1. b.Var(XY) = E(XY^2) - [E(XY)]^2= 64/315 - (64/315)^2= 52736/99225.

a. Var(Y|X = 0)In order to determine Var(Y|X = 0), we must first determine the conditional probability P(Y = 1|X = 0). Since X = 0 means there are no white balls in the sample of size 4, we know that all 4 balls are black. Thus, the probability of drawing a white ball from the remaining 6 balls in the box is:P(Y = 1|X = 0) = P(drawing a white ball from 6 black and 4 white balls) = 4/10 = 2/5.

Now, we can use the formula for conditional variance:Var(Y|X = 0) = E(Y^2|X = 0) - [E(Y|X = 0)]^2Since Y only takes on the values 0 and 1, we can simplify this expression:Var(Y|X = 0) = E(Y^2|X = 0) - [P(Y = 1|X = 0)]^2To find E(Y^2|X = 0), we need to compute the conditional probabilities P(Y = 0|X = 0) and P(Y = 1|X = 0) for all possible outcomes of the additional ball draw:If we draw a black ball, then Y = 0. The probability of this happening is:P(Y = 0|X = 0) = P(drawing a black ball from 6 black and 4 white balls) = 6/10 = 3/5If we draw a white ball, then Y = 1.

The probability of this happening is:P(Y = 1|X = 0) = P(drawing a white ball from 6 black and 4 white balls) = 4/10 = 2/5Now we can compute E(Y^2|X = 0) as follows:E(Y^2|X = 0) = P(Y = 0|X = 0)(0)^2 + P(Y = 1|X = 0)(1)^2= (3/5)(0) + (2/5)(1) = 2/5Finally, we can plug in all our values into the formula for conditional variance:Var(Y|X = 0) = E(Y^2|X = 0) - [P(Y = 1|X = 0)]^2= 2/5 - (2/5)^2= 6/25b. Var(XY = 1)In order to determine Var(XY = 1), we must first find E(XY) and E(X).

To find E(XY), we need to compute the joint probability distribution of X and Y. Since X and Y are not independent, we can't just multiply their marginal distributions.P(X = 0, Y = 1) is the probability that no white balls are selected in the initial sample of size 4 AND a white ball is selected from the remaining 6 balls in the box:P(X = 0, Y = 1) = P(no white balls in sample of size 4) * P(drawing a white ball from 6 black and 4 white balls)= (6/10)(5/9)(4/8)(3/7) * (4/10) = 2/63.

b. Similarly, we can find the probabilities for all other possible outcomes:P(X = 1, Y = 0) = P(1 white ball in sample of size 4) * P(drawing a black ball from 6 black and 3 white balls)= (4/10)(6/9)(4/8)(3/7) * (6/10) = 36/315P(X = 1, Y = 1) = P(1 white ball in sample of size 4) * P(drawing a white ball from 6 black and 3 white balls)= (4/10)(6/9)(4/8)(3/7) * (4/10) = 16/315P(X = 2, Y = 0) = P(2 white balls in sample of size 4) * P(drawing a black ball from 6 black and 2 white balls)= (6/10)(4/9)(3/8)(3/7) * (6/10) = 54/315P(X = 2, Y = 1) = P(2 white balls in sample of size 4) * P(drawing a white ball from 6 black and 2 white balls)= (6/10)(4/9)(3/8)(3/7) * (4/10) = 24/315P(X = 3, Y = 0) = P(3 white balls in sample of size 4) * P(drawing a black ball from 6 black and 1 white ball)= (4/10)(3/9)(2/8)(3/7) * (6/10) = 36/315P(X = 3, Y = 1) = P(3 white balls in sample of size 4) * P(drawing a white ball from 6 black and 1 white ball)= (4/10)(3/9)(2/8)(3/7) * (4/10) = 16/315P(X = 4, Y = 0) = P(all 4 white balls in sample of size 4) * P(drawing a black ball from 6 black and 0 white balls)= (4/10)(3/9)(2/8)(1/7) * (6/10) = 6/315P(X = 4, Y = 1) = P(all 4 white balls in sample of size 4) * P(drawing a white ball from 6 black and 0 white balls)= (4/10)(3/9)(2/8)(1/7) * (4/10) = 4/315.

Now we can compute E(XY) as follows:E(XY) = ΣXiYiP(Xi, Yi) = (0)(2/63) + (0)(36/315) + (1)(16/315) + (2)(24/315) + (3)(16/315) + (0)(6/315) + (0)(4/315) = 64/315Next, we can compute E(X) as follows:E(X) = ΣXiP(Xi) = (0)(6/210) + (1)(80/210) + (2)(90/210) + (3)(24/210) + (4)(1/210) = 18/7Finally, we can plug in all our values into the formula for variance:Var(XY) = E(XY^2) - [E(XY)]^2Since XY only takes on the values 0 and 1, we can simplify this expression:E(XY^2) = P(XY = 0)(0)^2 + P(XY = 1)(1)^2= (64/315)(1) + (251/315)(0) = 64/315Therefore,Var(XY) = E(XY^2) - [E(XY)]^2= 64/315 - (64/315)^2= 52736/99225.

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The expression for X⁻¹ is CD⁻¹B⁻¹A⁻¹.

To find the expression for the solution to C, substitute the given values into the equation X = CDBDA⁻¹:

X = CDBDA⁻¹

Now, solve for C:

C = X(DBDA⁻¹)⁻¹

To prove that det(X) = det(D)det(A - BD⁻¹C), we'll start with the expression for X and work towards the desired result:

X = CDBDA⁻¹

Let's denote M = DBDA⁻¹ for simplicity. Now, substitute M into the equation for X:

X = CM

Taking the determinant of both sides:

det(X) = det(CM)

Using the determinant property det(AB) = det(A)det(B):

det(X) = det(C)det(M)

Now, express M in terms of the given matrices:

M = DBDA⁻¹

= DB(A - BD⁻¹C)A⁻¹ (using the given expression A - BD⁻¹C)

Substituting this back into the equation for det(X):

det(X) = det(C)det(DB(A - BD⁻¹C)A⁻¹)

Applying the determinant property det(AB) = det(A)det(B):

det(X) = det(C)det(D)det(B(A - BD⁻¹C)A⁻¹)

Next, use the determinant property det(AB) = det(A)det(B) to expand the term B(A - BD⁻¹C)A⁻¹:

det(X) = det(C)det(D)det(B)det(A - BD⁻¹C)det(A⁻¹)

Since det(A⁻¹) is the inverse of det(A), it is equal to 1/det(A):

det(X) = det(C)det(D)det(B)det(A - BD⁻¹C)/det(A)

Now, rewrite the expression as:

det(X) = det(D)det(A - BD⁻¹C)det(CB)/det(A)

Using the property det(AB) = det(A)det(B) again, we have:

det(X) = det(D)det(A - BD⁻¹C)det(C)det(B)/det(A)

Since matrix B is a mxn matrix and matrix C is a nxm matrix, their determinants are equal:

det(X) = det(D)det(A - BD⁻¹C)det(B)det(B)/det(A)

det(B)det(B) is equal to the determinant of the square matrix B squared:

det(X) = det(D)det(A - BD⁻¹C)det(B²)/det(A)

Finally, we know that det(B²) is equal to the determinant of B multiplied by itself:

det(X) = det(D)det(A - BD⁻¹C)det(B)²/det(A)

Since we know that X is invertible, det(X) is nonzero, so we can divide both sides of the equation by det(X):

1 = det(D)det(A - BD⁻¹C)det(B)²/det(A)

det(D)det(A - BD⁻¹C)det(B)² = det(A)

Now, substituting the given value of 8 for det(X), we have:

det(D)det(A - BD⁻¹C)det(B)² = 8

This proves that det(X) = det(D)det(A - BD⁻¹C) = 8.

Finally, to find the expression for X⁻¹, we can use the fact that X = C

DBDA⁻¹:

X⁻¹ = (CDBDA⁻¹)⁻¹

= (ADB⁻¹C⁻¹D⁻¹B⁻¹A⁻¹C⁻¹)⁻¹

= CD⁻¹B⁻¹A⁻¹

Therefore, the expression for X⁻¹ is CD⁻¹B⁻¹A⁻¹.

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1. a) sqrt(-24) * sqrt(-3) simplifies to -6sqrt(2). b)(sqrt(-8)) / (sqrt(72))^2 simplifies to (i * sqrt(8)) / 24 2.a)w + z = -1 + 6i b)w - z = 7 + 4i c)wz = -17 - 17i d)w/z = -3/4 - 5/4 i. Let's determine:

(a) To find the product of two square roots of negative numbers, we can simplify as follows:

sqrt(-24) * sqrt(-3)

Using the property of square roots, we can rewrite this expression as:

sqrt((-1)(24)) * sqrt((-1)(3))

Taking the square root of -1, we get:

i * sqrt(24) * i * sqrt(3)

Simplifying further, we have:

i^2 * sqrt(24) * sqrt(3)

Since i^2 is equal to -1, the expression becomes:

-1 * sqrt(24) * sqrt(3)

Finally, simplifying the square roots, we get:

sqrt(24) * sqrt(3) = - 2sqrt(6) * sqrt(3) = - 2sqrt(18) = - 2sqrt(9 * 2) = - 6sqrt(2)

Therefore, sqrt(-24) * sqrt(-3) simplifies to -6sqrt(2).

(b) To simplify the quotient of two square roots, we can follow these steps:

(sqrt(-8)) / (sqrt(72))^2

Starting with the numerator:

sqrt(-8) = sqrt((-1)(8)) = sqrt(-1) * sqrt(8) = i * sqrt(8)

And for the denominator:

(sqrt(72))^2 = sqrt(72) * sqrt(72) = sqrt(72 * 72) = sqrt(5184) = 72

Now, substituting the numerator and denominator back into the expression:

(i * sqrt(8)) / 72

Simplifying further, we have:

i * (sqrt(8) / 72) = i * (sqrt(8) / 8 * 9) = i * (sqrt(8) / 8 * sqrt(9)) = i * (sqrt(8) / 8 * 3) = (i * sqrt(8)) / 24

Therefore, (sqrt(-8)) / (sqrt(72))^2 simplifies to (i * sqrt(8)) / 24.

(a) To find the sum of two complex numbers w and z in rectangular form, we simply add their real and imaginary parts:

w = 3 + 5i

z = -4 + i

Adding the real parts gives us:

3 + (-4) = -1

Adding the imaginary parts gives us:

5i + i = 6i

Therefore, w + z = -1 + 6i.

(b) To find the difference between two complex numbers w and z in rectangular form, we subtract their real and imaginary parts:

w = 3 + 5i

z = -4 + i

Subtracting the real parts gives us:

3 - (-4) = 7

Subtracting the imaginary parts gives us:

5i - i = 4i

Therefore, w - z = 7 + 4i.

(c) To find the product of two complex numbers w and z in rectangular form, we use the distributive property:

w = 3 + 5i

z = -4 + i

Multiplying the real parts gives us:

3 * (-4) = -12

Multiplying the imaginary parts gives us:

5i * i = 5i^2 = -5

Multiplying the real part of w by the imaginary part of z gives us:

3 * i = 3i

Multiplying the imaginary part of w by the real part of z gives us:

5i * (-4) = -20i

Adding the results together, we get:

-12 - 5 + 3i - 20i = -17 - 17i

Therefore, wz = -17 - 17i.

(d) To find the quotient of two complex numbers w and z in rectangular form, we divide their respective parts:

w = 3 + 5i

z = -4 + i

Dividing the real parts gives us:

(3) / (-4) = -3/4

Dividing the imaginary parts gives us:

(5i) / (i) = 5

Dividing the real part of w by the imaginary part of z gives us:

(3) / (i) = -3i

Dividing the imaginary part of w by the real part of z gives us:

(5i) / (-4) = -5/4 i

Putting the results together, we have:

-3/4 - 5/4 i

Therefore, w/z = -3/4 - 5/4 i.

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By following these steps, we have shown that under any assumptions, the implication (A ∧ ¬B) → ¬(A → B) holds.

To prove the statement ⊤ ⊢ (A ∧ ¬B) → ¬(A → B), we need to show that under any assumptions, the implication holds.

We will prove this using a natural deduction proof in propositional logic.

Assume A ∧ ¬B as an assumption.

Assumption on line 1.

From the assumption A ∧ ¬B, we can derive A using the ∧-elimination rule.

∧-elimination on line 1.

From the assumption A ∧ ¬B, we can derive ¬B using the ∧-elimination rule.

∧-elimination on line 1.

Assume A → B as an assumption.

Assumption on line 4.

From assumption 2, A, and assumption 4, A → B, we can derive B using the →-elimination rule.

→-elimination on lines 2 and 4.

From assumptions 3 and 5, we have a contradiction: B and ¬B cannot both be true simultaneously.

Contradiction on lines 3 and 5.

Using contradiction, we can conclude that our initial assumption A ∧ ¬B leads to a contradiction, and therefore, the assumption A ∧ ¬B → ¬(A → B) holds.

Using the →-introduction rule, we can conclude ⊤ ⊢ (A ∧ ¬B) → ¬(A → B).

→-introduction on lines 1-7.

By following these steps, we have shown that under any assumptions, the implication (A ∧ ¬B) → ¬(A → B) holds.

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The given iterated integral is ∫0⁶∫0³(xy)dydx. Using the iterated integral, evaluate the given integral, ∫0⁶∫0³(xy)dydx.

To evaluate this integral, we need to compute it in the following order:

integrate with respect to y first and then integrate with respect to x.

∫0³(xy)dy=[1/2(y²)x]0³ =[(9/2)x].

Thus, the integral becomes ∫0⁶[(9/2)x]dx=9/2(1/2)(6)²=81.

Therefore, ∫0⁶∫0³(xy)dydx=81.

The iterated integral of ∫0³(xy)dy with respect to y gives [(9/2)x], and then integrating this result with respect to x from 0 to 6 gives 9/2(1/2)(6)², which simplifies to 81.

Therefore, the value of the given integral ∫0⁶∫0³(xy)dydx is indeed 81.

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The p-value of the test is 0.0037. The one-sentence conclusion written like a statistician: At a significance level of 0.05, there is sufficient evidence to suggest that more than 30% of US smartphone owners use their phones while watching television (z = 2.697, p = 0.0037).

A researcher claims that more than 30% of US smartphone owners use their phones while watching television. In a simple random sample of 150 smartphone owners, 38% say that they use their phones while watching television.

Solution:We are testing the null hypothesis that the proportion of smartphone owners who use their phone while watching television is 30% versus the alternative hypothesis that it is more than 30%. Therefore, the appropriate test is a one-tailed z-test.The null and alternative hypotheses are as follows:Null hypothesis, H0: p ≤ 0.30

Alternative hypothesis, H1: p > 0.30 Where p is the true proportion of smartphone owners who use their phones while watching television.The test statistic is given by:z = (p - p0)/[p0(1 - p0)/n]^0.5

Where p0 is the hypothesized proportion under the null hypothesis, which is 0.30 in this case.Substituting the values, we getz = (0.38 - 0.30)/[0.30(0.70)/150]^0.5z = 2.697

Using a standard normal distribution table, the p-value for this test is 0.0037. Therefore, at the α = 0.05 level, we reject the null hypothesis and conclude that there is sufficient evidence to support the researcher's claim that more than 30% of US smartphone owners use their phones while watching television.

The p-value of the test is 0.0037. The one-sentence conclusion written like a statistician: At a significance level of 0.05, there is sufficient evidence to suggest that more than 30% of US smartphone owners use their phones while watching television (z = 2.697, p = 0.0037).

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A quartic function is a polynomial function with the highest degree of 4. The general form of a quartic function is as follows: n f(x) = ax⁴ + bx³ + cx² + dx + e We are given that the zeros are -4, 1, and 3 (order 2) and that it passes through the point (2,6).

Therefore, we can represent the quartic function in the form of factors as below:

f(x) = a(x + 4)(x - 1)²(x - 3)²

In order to find the value of 'a', we can use the point (2,6) which is on the graph. Substitute the values of 'x' and 'y' in the above equation and solve for 'a'.

6 = a(2 + 4)(2 - 1)²(2 - 3)² ⇒ 6 = a(6)(1)(1) ⇒ a = 1

Therefore, the equation for the quartic function which has zeros at -4, 1, and 3 (order 2) and passes through the point (2,6) is:

f(x) = (x + 4)(x - 1)²(x - 3)².

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The graph of the function y = f(x - 2) + 3 is obtained by shifting the graph of the original function f(x) two units to the right and three units upward. The general shape and characteristics of the original graph are preserved, but its position in the coordinate plane is altered.

The graph of the function is a transformation of the graph of the original function f(x) with the expression y = f(x - 2) + 3.

Transformations are alterations of the basic function, and each transformation includes shifting, scaling, and reflecting.

Hence, the graph of y = f(x - 2) + 3 is a transformation of the graph of the original function f(x) where it is shifted right by 2 units and up by 3 units.

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The probability of getting a head on the first toss and a tail on the last toss is (1/4) * (3/4) = 3/16.

To calculate the probability of getting a head on the first toss and a tail on the last toss, we multiply the individual probabilities of each event.

The probability of getting a head on the first toss is given as 1/4, since the coin has a head probability of 1/4.

Similarly, the probability of getting a tail on the last toss is given as 3/4, as the coin has a tail probability of 3/4.

To find the probability of both events occurring together, we multiply these probabilities: (1/4) * (3/4) = 3/16.

Therefore, the probability of getting a head on the first toss and a tail on the last toss, when tossing the unfair coin four times, is 3/16.

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To find the quadratic approximation of the function f at the point P = (0, 0, 0, 0), we need to compute the partial derivatives of f with respect to each variable at the point P.

The partial derivatives of f are as follows:

∂ƒ/∂x = 1 + 2x

∂ƒ/∂y = -2cos(z - 2y)

∂ƒ/∂z = cos(z - 2y)

∂ƒ/∂w = -e³w

∂²ƒ/∂x² = 2

∂²ƒ/∂y² = 4sin(z - 2y)

∂²ƒ/∂z² = -sin(z - 2y)

∂²ƒ/∂w² = -3e³w

Using these partial derivatives, we can construct the quadratic approximation of f at P:

Q(x, y, z, w) = f(0, 0, 0, 0) + ∂ƒ/∂x(0, 0, 0, 0)x + ∂ƒ/∂y(0, 0, 0, 0)y + ∂ƒ/∂z(0, 0, 0, 0)z + ∂ƒ/∂w(0, 0, 0, 0)w + (1/2)∂²ƒ/∂x²(0, 0, 0, 0)x² + (1/2)∂²ƒ/∂y²(0, 0, 0, 0)y² + (1/2)∂²ƒ/∂z²(0, 0, 0, 0)z² + (1/2)∂²ƒ/∂w²(0, 0, 0, 0)w²

Substituting the values:

Q(x, y, z, w) = 1 + 0 + 0 + 0 + 0 + (1/2)(2)x² + (1/2)(4sin(0))y² + (1/2)(-sin(0))z² + (1/2)(-3e³(0))w²

Q(x, y, z, w) = 1 + x²

Now we can estimate the value of f(0.1, -0.1, -0.1, 0.1) using the quadratic approximation:

f(0.1, -0.1, -0.1, 0.1) ≈ Q(0.1, -0.1, -0.1, 0.1) = 1 + (0.1)² = 1 + 0.01 = 1.01

Therefore, the estimated value of f(0.1, -0.1, -0.1, 0.1) using the quadratic approximation is approximately 1.01.

Now, let's compute Dₚ(g∘ƒ), where P = (0, 0, 0, 0), using the chain rule.

Dₚ(g∘ƒ) = Dₚg ∘ Dₚƒ

First, let's compute Dₚƒ:

Dₚƒ = (∂ƒ/∂x, ∂ƒ/∂y, ∂ƒ/∂z, ∂ƒ/∂w) at P

Dₚƒ = (1 + 2(0), -2cos(0 - 2(0)), cos(0 - 2(0)), -e³(0))

Dₚƒ = (1, -2, 1, -1)

Next, let's compute Dₚg:

Dₚg = (∂g₁/∂x, ∂g₁/∂y, ∂g₁/∂z, ∂g₁/∂w, ∂g₂/∂x, ∂g₂/∂y, ∂g₂/∂z, ∂g₂/∂w) at P

Dₚg = (cos(0 - 0), 0, 0, 0, 0, 0, 0, 0)

Dₚg = (1, 0, 0, 0, 0, 0, 0, 0)

Finally, we can compute Dₚ(g∘ƒ) by taking the composition of Dₚg and Dₚƒ:

Dₚ(g∘ƒ) = Dₚg ∘ Dₚƒ

Dₚ(g∘ƒ) = (1, 0, 0, 0, 0, 0, 0, 0) ∘ (1, -2, 1, -1)

Dₚ(g∘ƒ) = (1, 0, 0, 0, 0, 0, 0, 0)

Therefore, Dₚ(g∘ƒ) = (1, 0, 0, 0, 0, 0, 0, 0) at P = (0, 0, 0, 0).

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To determine which of the given straight line equations are perpendicular to the line 8y = 12x + 8, we need to compare their slopes. So the correct answer is option a.

The given line has the equation 8y = 12x + 8. To find its slope, we can rewrite it in slope-intercept form (y = mx + b), where m represents the slope. Dividing both sides of the equation by 8 gives us y = (3/2)x + 1.

The slope of this line is 3/2. Now let's examine the slopes of the given options:

a. The equation 3y = 12 + 2x can be rewritten as y = (2/3)x + 4/3, which has a slope of 2/3.

b. The equation 2y = 4 + 3x can be rewritten as y = (3/2)x + 2, which has a slope of 3/2.

c. The equation 2y = 6 - 3x can be rewritten as y = (-3/2)x + 3, which has a slope of -3/2.

d. The equation 6y = 6 - 4x can be rewritten as y = (-4/6)x + 1, which simplifies to y = (-2/3)x and has a slope of -2/3.

Comparing the slopes, we see that option a has a slope of 2/3, which is the negative reciprocal of the original line's slope of 3/2. Therefore, option a is perpendicular to the line 8y = 12x + 8.

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The Miller-Rabin test's algorithm will be used to show that the Fermat number F₁ is not a prime. So, we now have to establish that F is a probable prime.

Fermat's test:Let's recall Fermat's test, which is based on Fermat's Little Theorem. For a prime number p and an integer a that is coprime to p, Fermat's Little Theorem states that a^(p−1) ≡ 1 (mod p).

Therefore, if for a given integer n, a^(n−1) ≡ 1 (mod n) is false for any a coprime to n, then n is not a prime. By Fermat's test, the Fermat number F = 2^(2^k) + 1 is not a prime if and only if 2^((2^k)(n−1)) ≢ 1 (mod F) for some integer n and gcd(2, F) = 1. Now, we'll use Fermat's test to show that the Fermat number F₁ is not a prime.Miller-Rabin test:Miller-Rabin is a randomized primality test that is widely utilized. It is an iterative probabilistic algorithm for determining whether or not a number is prime.

The algorithm performs k tests to determine whether a number is prime with a certain probability of error. Miller-Rabin's test is utilized to see if a number is composite or a strong probable prime with high probability (which is not less than (1/4)^k for k rounds).

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The gradient of AB is 5/4. The midpoint P of BD is (2, 4). The coordinates of C are (1, 3). The equation of CD is y - 3 = -1/5(x - 1). The coordinates of E are (7, 0). The inclination of the line AE is 36 degrees. The size of angle AÐ is 135 degrees. The length of BC is 5 units.

To find the gradient of AB, we need to divide the change in the y-coordinate by the change in the x-coordinate. The change in the y-coordinate is 6 - 4 = 2. The change in the x-coordinate is 3 - (-1) = 4. Therefore, the gradient of AB is 2/4 = 5/4.

To find the midpoint P of BD, we need to average the x-coordinates and the y-coordinates of B and D. The x-coordinate of B is 3 and the x-coordinate of D is 4. The y-coordinate of B is 6 and the y-coordinate of D is 1. Therefore, the midpoint P of BD is (3 + 4)/2, (6 + 1)/2 = (2, 4).

To find the coordinates of C, we need to use the fact that opposite sides of a parallelogram are equal in length and parallel. The length of AB is 5 units. The x-coordinate of A is -1 and the x-coordinate of D is 4.

Therefore, the x-coordinate of C is (-1 + 4)/2 = 1. The y-coordinate of A is 4 and the y-coordinate of D is 1. Therefore, the y-coordinate of C is (4 + 1)/2 = 3. Therefore, the coordinates of C are (1, 3).

To find the equation of CD, we need to use the fact that the gradient of CD is the negative reciprocal of the gradient of AB. The gradient of AB is 5/4.

Therefore, the gradient of CD is -4/5. The y-intercept of CD is the y-coordinate of C, which is 3. Therefore, the equation of CD is y - 3 = -4/5(x - 1).

To find the coordinates of E, we need to solve the equation of CD for x. The equation of CD is y - 3 = -4/5(x - 1). We can solve for x by substituting y = 0. When y = 0, the equation becomes 0 - 3 = -4/5(x - 1). We can then solve for x to get x = 7. Therefore, the coordinates of E are (7, 0).

To find the inclination of the line AE, we need to use the fact that the inclination of a line is equal to the arctangent of the gradient of the line. The gradient of AE is the same as the gradient of AB, which is 5/4. Therefore, the inclination of the line AE is arctan(5/4) = 36 degrees.

To find the size of angle AÐ, we need to use the fact that opposite angles in a parallelogram are equal. The size of angle AÐ is equal to the size of angle BCD. The size of angle BCD is 180 degrees - 135 degrees = 45 degrees. Therefore, the size of angle AÐ is 45 degrees.

To find the length of BC, we need to use the distance formula. The distance formula states that the distance between two points is equal to the square root of the difference of the x-coordinates squared plus the difference of the y-coordinates squared.

The x-coordinates of B and C are 3 and 1, respectively. The y-coordinates of B and C are 6 and 3, respectively. Therefore, the length of BC is equal to the square root of (3 - 1)^2 + (6 - 3)^2 = 5 units.

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To find the annual nominal interest rate, we can use the formula for calculating the present value of an annuity:

PV = PMT * (1 - (1 + r)^(-n)) / r

Where:

PV = Present value of the loan (loan amount) = $65,000

PMT = Monthly installment = $1,445.89

r = Annual interest rate (in decimal form)

n = Number of periods (in this case, the number of monthly installments, which is 5 years * 12 months = 60)

We need to solve for the annual interest rate (r) in the equation.

Rearranging the equation, we have:

r = (1 - (PV / PMT)^(1/n)) - 1

Substituting the given values:

r = (1 - (65,000 / 1,445.89)^(1/60)) - 1

Calculating this expression, we find:

r ≈ 0.008 = 0.8%

Therefore, the annual nominal interest rate that the company is paying is approximately 0.8%, which corresponds to option A.

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To find the number of miles at which the cost of the gas-only SUV exceeds the cost of the hybrid, we need to determine the point at which the total cost of the gas-only SUV (including the purchase price and maintenance costs) surpasses the total cost of the hybrid.

Let's assume the number of miles driven is represented by 'm'.

For the gas-only SUV:

Total cost = Purchase price + Maintenance cost per mile * Number of miles

Total cost = $25,535 + $0.18 * m

We want to find the value of 'm' where the total cost of the gas-only SUV exceeds the total cost of the hybrid.

Setting up the equation:

$25,535 + $0.18 * m > $32,395 + $0.13 * m

Now, we can solve for 'm': $0.18 * m - $0.13 * m > $32,395 - $25,535

$0.05 * m > $6,860

m > $6,860 / $0.05 m > 137,200

Therefore, the cost of the gas-only SUV will exceed the cost of the hybrid SUV after driving more than 137,200 miles.

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If A is a singular matrix then det(ABAB)= 0. Option B

The determinant (det(A)) of a singular matrix A is equal to zero. In this situation, the ABAB product's determinant can be calculated as follows:

det(ABAB) is equal to (A) * (B) * (A) * (B)).

No matter what the determinant of matrix B is, the entire product is 0 since det(A) is zero. Because A is a singular matrix, the determinant of ABAB is always zero.

Thus, we can say that the value of det(ABAB) is equivalent to zero.

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Hence, the correct option is None of the mentioned.

Let A and B be n×n matrices. If A is a singular matrix then det(ABAB) = 0.

Matrices are a collection of numbers placed in a square or rectangular array. They are used to organize information in such a way that it is easily available and can be processed quickly. There are two kinds of matrices that are used: the row matrix and the column matrix. A matrix is represented by square brackets on the outside with commas and semi-colons separating the entries on the inside.A singular matrix is defined as a matrix in which the determinant of a matrix is zero. For a square matrix A, the determinant of A is defined as a linear function of its columns. If A is singular, the columns of A are linearly dependent, which means that one column is a linear combination of others. Thus, the determinant of A is zero. If A is a singular matrix, then det(ABAB) = 0.

Therefore, the answer is zero (0).Hence, the correct option is None of the mentioned.

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There are 4 elements in the set (A ∪ C) ∩ (A ∩ C).

Given sets A and B as subsets of universal set S, where: Set A = {3, 4, 5, 6, 7, 8, 15, 18, 19} Set B = {2, 4, 5, 6, 7, 8, 10, 11, 13, 14, 15, 20} Set C {3, 6, 13, 18, 19, 20}.

To find the number of elements in the set (A ∩ B) ∩ (A ∩ B).

We can find the intersection between sets A and B. A ∩ B = {4, 5, 6, 7, 8, 15}.

Again, we can find the intersection between set A and set B. (A ∩ B) ∩ (A ∩ B) = {4, 5, 6, 7, 8, 15}.

Therefore, there are 6 elements in the set (A ∩ B) ∩ (A ∩ B).

To find the number of elements in the set (B ∪ C) ∩ (B ∪ C)We can find the union between sets B and C. B ∪ C = {2, 3, 4, 5, 6, 7, 8, 10, 11, 13, 14, 15, 18, 19, 20}.

Again, we can find the union between set B and set C. (B ∪ C) ∩ (B ∪ C) = {3, 4, 5, 6, 7, 8, 13, 15, 18, 19, 20}.Therefore, there are 11 elements in the set (B ∪ C) ∩ (B ∪ C).

To find the number of elements in the set (A ∪ C) ∩ (A ∩ C)We can find the union between sets A and C. A ∪ C = {2, 3, 4, 5, 6, 7, 8, 10, 11, 13, 14, 15, 18, 19, 20}.

Again, we can find the intersection between set A and set C. (A ∩ C) = {3, 18, 19, 20}.

Therefore, (A ∪ C) ∩ (A ∩ C) = {3, 18, 19, 20}.Hence, there are 4 elements in the set (A ∪ C) ∩ (A ∩ C).Venn Diagram can help you understand the concepts easily:

Therefore, the main answers are:(A ∩ B) ∩ (A ∩ B) = 6(B ∪ C) ∩ (B ∪ C) = 11(A ∪ C) ∩ (A ∩ C) = 4.

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We need to find the general solution of the given system. We know that the general solution of a system of linear equations is given byx(t) = c1x1(t) + c2x2(t)

Here, the given system

isx′ = (31−41​)x

By using the characteristic equation method, we can find the solution. Let x′ = mx, then we have,

m = (31−4m)(−1)m2 − 3m + 4 = 0

⇒ m2 − 3m + 4m = 0

⇒ m2 + m − 4m = 0

⇒ m(m + 1) − 4(m + 1) = 0

⇒ (m − 4)(m + 1) = 0

⇒ m = 4, −1

Let

m1 = 4,

m2 = −1

The corresponding eigenvectors of

(31−41​) arev1 = (41) and

v2 = (11)

So, the general solution of the system is,

x(t) = c1(41)et + c2(11)e−t

The general solution of the system is,

x(t) = c1(41)et + c2(11)e−t,

where c1 and c2 are constants. We can also verify that the given solution is true by substituting x(t) in the differential equation as follows:

x′ = (31−41​)x

⇒ (c1(41)et + c2(11)e−t)′

= (31−41​)(c1(41)et + c2(11)e−t)

⇒ (c1(41)et + c2(−1)e−t)′
= (c1(3−4)4et + c2(−1)(−1)e−t)⇒ 4c1(41)et − c2(11)e−t

= 3c1(41)et − 4c1(11)e−t + 3c2(41)et + 4c2(11)e−t

⇒ 4c1(41)et − 3c1(41)et + 4c1(11)e−t − 3c2(41)et

= c2(11)e−t − 4c2(11)e−t

⇒ c1(41)et + c2(11)e−t = c1(41)et + c2(11)e−t

Hence, the given solution is the general solution of the given system.

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The return after 30 years will be approximately $1,186.81.

To calculate the return on the deposited amount after 30 years with a monthly interest rate of 1/2%, compounded periodically, we can use the compound interest formula:

�

=

�

(

1

+

�

�

)

�

�

A=P(1+

n

r

​

)

nt

Where:

A = the future value of the investment/return

P = the principal amount (initial deposit)

r = the interest rate (in decimal form)

n = the number of times interest is compounded per period

t = the number of periods

In this case:

P = $1,000

r = 1/2% = 0.005 (converted to decimal)

n = 1 (compounded monthly)

t = 30 years = 30 * 12 = 360 months

Substituting these values into the formula, we get:

�

=

1000

(

1

+

0.005

1

)

1

⋅

360

A=1000(1+

1

0.005

​

)

1⋅360

Simplifying:

�

=

1000

(

1.005

)

360

A=1000(1.005)

360

Using a calculator, we find:

�

≈

1186.81

A≈1186.81

Therefore, the return after 30 years will be approximately $1,186.81.

After 30 years, the initial deposit of $1,000 will grow to approximately $1,186.81, considering a monthly interest rate of 1/2% compounded periodically.

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