Determine a vector equation for the plane represented by the equation 2x + 3y + z-1 = 0.

To evaluate the triple integral of sin^3(θ) dv over the given pyramid-shaped region, we need to determine the limits of integration and the order of integration.

The pyramid with vertices (0,0,0), (0,1,0), (1,1,0), and (0,1,1) can be defined by the following limits:

0 ≤ z ≤ 1

0 ≤ y ≤ 1 - z

0 ≤ x ≤ y

Since the order of integration is not specified, we can choose any suitable order. Let's evaluate the integral using the order dz dy dx.

The integral becomes:

∫∫∫ [tex]\sin^3(\theta)[/tex] dv = ∫[0,1] ∫[0,1-z] ∫[0,y] [tex]\sin^3(\theta)[/tex]dx dy dz

We integrate with respect to x first:

∫[0,1] ∫[0,1-z] y [tex]\sin^3(\theta)[/tex]dy dz

Next, we integrate with respect to y:

∫[0,1] [[tex](1 - z)^(4/3)][/tex] [tex]\sin^3(\theta)[/tex] dz

Finally, we integrate with respect to z:[∫[0,1] [tex](1 - z)^(4/3)[/tex]dz] [tex]\sin^3(\theta)[/tex]

The integral ∫[0,1] [tex](1 - z)^(4/3)[/tex] dz can be evaluated using basic calculus techniques. After evaluating this integral, the result can be multiplied by [tex]\sin^3(\theta)[/tex]to obtain the final value.

Please note that the value of θ is not provided in the given problem, so the final result will depend on the specific value of θ chosen.

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The distance between points C and D is 8.36. Ans. (C(x = -1.860, y = -3.99, z = 2); D(p = 4.05, θ = 140.0°, z = -3); 8.36)

(a) Given C(p = 4.4, θ = -115°, z = 2)Convert from polar coordinates to rectangular coordinates:

            We know that 4.4 is the value of radius and -115 degrees is the value of θ.

The formula to find rectangular coordinates is x = r cos(θ) and

                                                     y = r sin(θ).

So, x = 4.4 cos(-115°) and y = 4.4 sin(-115°)

Then, x = 4.4 cos(245°) and y = 4.4 sin(245°)

Multiplying both the sides by 10, we get,C(x = -1.860, y = -3.99, z = 2)

Thus, the rectangular coordinates of the point C are (x = -1.860, y = -3.99, z = 2).

(b) Given D(x = -3.1, y = 2.6, z = -3) Convert from rectangular coordinates to cylindrical coordinates:

                        We know that x = -3.1, y = 2.6, and z = -3.To convert rectangular coordinates to cylindrical coordinates, we need to use the following formulas: r = √(x² + y²)θ = tan⁻¹ (y/x)z = z

Putting the given values in the above formulas, we get, r = √((-3.1)² + 2.6²)

                                 = √(10.17)θ

                                = tan⁻¹ (2.6/-3.1)

                                = -140.0° (converted to degrees)z = -3Multiplying both the sides by 10,

we get,D(p = 4.05, θ = 140.0°, z = -3)

Thus, the cylindrical coordinates of the point D are (p = 4.05, θ = 140.0°, z = -3).

(c) Distance between points C and DWe have coordinates of both C and D. We can find the distance between C and D using the distance formula.

Distance = √[(x₂ - x₁)² + (y₂ - y₁)² + (z₂ - z₁)²]

Substituting the given values in the above formula, we get,

                            Distance = √[(-1.860 - (-3.1))² + (-3.99 - 2.6)² + (2 - (-3))²]

                                           = √[1.24² + (-1.39)² + 5²] = 8.36

Therefore, the distance between points C and D is 8.36. Ans. (C(x = -1.860, y = -3.99, z = 2); D(p = 4.05, θ = 140.0°, z = -3); 8.36)

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The general solution to the given differential equation 21y" - 4y' - 12y = 0 is y(t) = Asin(√3t) + Bcos(√3t), where A and B are arbitrary constants.

To find the general solution to the given differential equation 21y" - 4y' - 12y = 0, we assume a solution of the form y(t) = e^(rt). Substituting this into the differential equation, we obtain the characteristic equation:

21r^2 - 4r - 12 = 0.

Solving this quadratic equation, we find two distinct roots: r_1 = (2/7) and r_2 = -2/3. Therefore, the general solution to the homogeneous differential equation is y_h(t) = Ae^((2/7)t) + Be^(-2/3t), where A and B are arbitrary constants.

However, in this case, we are given an initial value problem (IVP) with specific values of y(0) and y'(0). We need to find the particular solution that satisfies these initial conditions.

To verify if y(t) = sin(t) + 3cos(6t) is a solution to the IVP, we substitute t = 0 into the equation and its derivative:

y(0) = sin(0) + 3cos(60) = 0 + 3(1) = 3,

y'(0) = cos(0) - 18sin(60) = 1 - 0 = 1.

As the given solution y(t) satisfies the initial conditions y(0) = 3 and y'(0) = 1, it is indeed a solution to the IVP.

Finally, to find the maximum of |y(t)| for t approaching infinity, we need to consider the behavior of the functions sin(t) and 3cos(6t) individually. Since sin(t) and cos(6t) have amplitudes of 1 and 3, respectively, the maximum value of |y(t)| will occur when sin(t) reaches its maximum amplitude, which is 1.

Therefore, the maximum value of |y(t)| is |1 + 3cos(6t)| = 1 + 3|cos(6t)|. As t approaches infinity, the maximum value of |cos(6t)| is 1, so the overall maximum value of |y(t)| is 1 + 3 = 4.

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when adding or multiplying three or more numbers, the grouping of the numbers does not affect the result by using associative property.

For addition, the associative property can be expressed as:

(a + b) + c = a + (b + c)

This means that when adding three numbers, it doesn't matter if we first add the first two numbers and then add the third number, or if we first add the last two numbers and then add the first number. The result will be the same.

For example, let's take the numbers 2, 3, and 4:

(2 + 3) + 4 = 5 + 4 = 9

2 + (3 + 4) = 2 + 7 = 9

The result is the same regardless of the grouping.

Similarly, the associative property also holds for multiplication:

(a * b) * c = a * (b * c)

This means that when multiplying three numbers, the grouping does not affect the result.

For example, let's take the numbers 2, 3, and 4:

(2 * 3) * 4 = 6 * 4 = 24

2 * (3 * 4) = 2 * 12 = 24

Again, the result is the same regardless of the grouping.

The associative property is a fundamental property in mathematics that allows us to regroup terms in a sum or product without changing the outcome.

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The correct solution of the linear differential equation dy/dx = xy^2, obtained by separating the variables, is y = -1/(c - x^2), where c is a constant.

To solve the given linear differential equation, we can separate the variables by writing it as dy/y^2 = xdx. Integrating both sides, we get ∫(1/y^2)dy = ∫xdx.

The integral of 1/y^2 with respect to y is -1/y, and the integral of x with respect to x is (1/2)x^2. Applying the antiderivatives, we have -1/y = (1/2)x^2 + c, where c is the constant of integration.

To isolate y, we can take the reciprocal of both sides, resulting in y = -1/(c - x^2), where c represents the constant of integration.

Therefore, the correct solution of the linear differential equation dy/dx = xy^2, obtained by separating the variables, is y = -1/(c - x^2), where c is a constant.

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Given the set of constraints: X1 + 7X2 + 3X3 + 7X4 ≤ 46...... (1)

3X1 X2 + X3 + 2X4 ≤ 8........... (2)

2X1 + 3X2-X3 + X4 ≤ 10....... (3)

Also, the objective function is given as:

Minimize Z = 5X1 - 4X2 + 6X3 + 8X4

We need to solve this problem using the Simplex method.

Therefore, we need to convert the given constraints and objective function into an augmented matrix form as follows:

$$\begin{bmatrix} 1 & 7 & 3 & 7 & 1 & 0 & 0 & 0 & 46\\ 3 & 1 & 2 & 1 & 0 & 1 & 0 & 0 & 8\\ 2 & 3 & -1 & 1 & 0 & 0 & 1 & 0 & 10\\ -5 & 4 & -6 & -8 & 0 & 0 & 0 & 1 & 0 \end{bmatrix}$$

In the augmented matrix, the last row corresponds to the coefficients of the objective function, including the constants (0 in this case).

Now, we need to carry out the simplex method to find the values of X1, X2, X3, and X4 that would minimize the value of the objective function. To do this, we follow the below steps:

Step 1: Select the most negative value in the last row of the above matrix. In this case, it is -8, which corresponds to X4. Therefore, we choose X4 as the entering variable.

Step 2: Calculate the ratios of the values in the constants column (right-most column) to the corresponding values in the column corresponding to the entering variable (X4 in this case). However, if any value in the X4 column is negative, we do not consider it for calculating the ratio. The minimum of these ratios corresponds to the departing variable.

Step 3: Divide all the elements in the row corresponding to the departing variable (Step 2) by the element in that row and column (i.e., the departing variable). This makes the departing variable equal to 1.

Step 4: Make all other elements in the entering variable column (i.e., the X4 column) equal to zero, except for the element in the row corresponding to the departing variable. To do this, we use elementary row operations.

Step 5: Repeat the above steps until all the elements in the last row of the matrix are non-negative or zero. This means that the current solution is optimal and the Simplex method is complete.In this case, the Simplex method gives us the following results:

$$\begin{bmatrix} 1 & 7 & 3 & 7 & 1 & 0 & 0 & 0 & 46\\ 3 & 1 & 2 & 1 & 0 & 1 & 0 & 0 & 8\\ 2 & 3 & -1 & 1 & 0 & 0 & 1 & 0 & 10\\ -5 & 4 & -6 & -8 & 0 & 0 & 0 & 1 & 0 \end{bmatrix}$$Initial Simplex tableau$ \Downarrow $$\begin{bmatrix} 1 & 0 & 5 & -9 & 0 & -7 & 0 & 7 & 220\\ 0 & 1 & 1 & -2 & 0 & 3 & 0 & -1 & 6\\ 0 & 0 & -7 & 8 & 0 & 4 & 1 & -3 & 2\\ 0 & 0 & -11 & -32 & 1 & 4 & 0 & 8 & 40 \end{bmatrix}$$

After first iteration

$ \Downarrow $$\begin{bmatrix} 1 & 0 & 0 & -3/7 & 7/49 & -5/7 & 3/7 & 8/7 & 3326/49\\ 0 & 1 & 0 & -1/7 & 2/49 & 12/7 & -1/7 & -9/14 & 658/49\\ 0 & 0 & 1 & -8/7 & -1/7 & -4/7 & -1/7 & 3/7 & -2/7\\ 0 & 0 & 0 & -91/7 & -4/7 & 71/7 & 11/7 & -103/7 & 968/7 \end{bmatrix}$$

After the second iteration

$ \Downarrow $$\begin{bmatrix} 1 & 0 & 0 & 0 & -6/91 & 4/13 & 7/91 & 5/13 & 2914/91\\ 0 & 1 & 0 & 0 & 1/91 & 35/26 & 3/91 & -29/26 & 1763/91\\ 0 & 0 & 1 & 0 & 25/91 & -31/26 & -2/91 & 8/26 & 54/91\\ 0 & 0 & 0 & 1 & 4/91 & -71/364 & -11/364 & 103/364 & -968/91 \end{bmatrix}$$

After the third iteration

$ \Downarrow $$\begin{bmatrix} 1 & 0 & 0 & 0 & 6/13 & 0 & 2/13 & 3/13 & 2762/13\\ 0 & 1 & 0 & 0 & 3/13 & 0 & -1/13 & -1/13 & 116/13\\ 0 & 0 & 1 & 0 & 2/13 & 0 & -1/13 & 2/13 & 90/13\\ 0 & 0 & 0 & 1 & 4/91 & -71/364 & -11/364 & 103/364 & -968/91 \end{bmatrix}$$

After the fourth iteration

$ \Downarrow $

The final answer is:

X1 = 2762/13,

X2 = 116/13,

X3 = 90/13,

X4 = 0

Therefore, the minimum value of the objective function

Z = 5X1 - 4X2 + 6X3 + 8X4 is given as:

Z = (5 x 2762/13) - (4 x 116/13) + (6 x 90/13) + (8 x 0)

Z = 14278/13

Therefore, the final answer is Z = 1098.15 (approx).

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We can conclude that V = null(g) ∪ {xu : x ∈ C}. This shows that for any g ∈ L(V, C) and u ∈ V with g(u) ≠ 0, we have V = null(g) ∪ {xu : x ∈ C}.

To show that for any g ∈ L(V, C) and u ∈ V with g(u) ≠ 0, we have V = null(g) ∪ {xu : x ∈ C}, we need to prove two things: Every vector in V can be written as either an element of null(g) or as xu for some x ∈ C. The vectors in null(g) and xu are distinct for different choices of x. Let's proceed with the proof: Consider any vector v ∈ V. We need to show that v belongs to either null(g) or xu for some x ∈ C.

If g(v) = 0, then v ∈ null(g), and we are done. If g(v) ≠ 0, we can define x = (g(v))⁻¹. Since g(v) ≠ 0, x is well-defined. Now, let's consider the vector xu. Applying g to xu, we have g(xu) = xg(u) = (g(u))(g(v))⁻¹. Since g(u) ≠ 0 and (g(v))⁻¹ is well-defined, g(xu) ≠ 0. Therefore, v does not belong to null(g), and it can be written as xu for some x ∈ C. Hence, every vector v ∈ V can be written as either an element of null(g) or as xu for some x ∈ C. To show that null(g) and xu are distinct for different choices of x, we assume xu = yu for some x, y ∈ C. Then, we have xu - yu = 0, which implies (x - y)u = 0.

Since u ≠ 0 and C is a field, we can conclude that x - y = 0, which means x = y. Therefore, for distinct choices of x, the vectors xu are distinct. Hence, null(g) and xu are distinct for different choices of x. As we have established both points, we can conclude that V = null(g) ∪ {xu : x ∈ C}. This shows that for any g ∈ L(V, C) and u ∈ V with g(u) ≠ 0, we have V = null(g) ∪ {xu : x ∈ C}.

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Given vector function is

F = (5z +5x4) i¯+ (3y + 6z + 6 sin(y4)) j¯+ (5x + 6y + 3e²¹) k

(a) Curl of F is given by

The curl of F is curl

F = [tex](6cos(y^4))i + 5j + 4xi - (6cos(y^4))i - 6k[/tex]

= 4xi - 6k

(b) The answer to part (a) tells that the J.C. of F is zero over any loop in [tex]R^3[/tex].

(c) If C1 is any closed curve in[tex]R^3[/tex], then ∫C1 F. dr = 0.

(d) Given Cl is the half-circle

[tex](x - 20)^2 + (y - 35)^2[/tex] = 1, y > 35.

It is traversed from (21, 35) to (19, 35).

To find the line integral of F over Cl, we use Green's theorem.

We know that,

∫C1 F. dr = ∫∫S (curl F) . dS

Where S is the region enclosed by C1 in the xy-plane.

C1 is made up of a half-circle with a line segment joining its endpoints.

We can take two different loops S1 and S2 as shown below:

Here, S1 and S2 are two loops whose boundaries are C1.

We need to find the line integral of F over C1 by using Green's theorem.

From Green's theorem, we have,

∫C1 F. dr = ∫∫S1 (curl F) . dS - ∫∫S2 (curl F) . dS

Now, we need to find the surface integral of (curl F) over the two surfaces S1 and S2.

We can take S1 to be the region enclosed by the half-circle and the x-axis.

Similarly, we can take S2 to be the region enclosed by the half-circle and the line x = 20.

We know that the normal to S1 is -k and the normal to S2 is k.

Thus,∫∫S1 (curl F) .

dS = ∫∫S1 -6k . dS

= -6∫∫S1 dS

= -6(π/2)

= -3π

Similarly,∫∫S2 (curl F) . dS = 3π

Thus,

∫C1 F. dr = ∫∫S1 (curl F) . dS - ∫∫S2 (curl F) . dS

= -3π - 3π

= -6π

Therefore, J.C. of F over the half-circle is -6π.

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The values of C₁ and C₂ can be determined by solving the given differential equation and applying the initial conditions. The correct answer is (c) C₁,2 = 1 & 0.

To solve the differential equation y" + y = sec(x)tan(x), we can use the method of undetermined coefficients.

Since the right-hand side of the equation contains sec(x)tan(x), we assume a particular solution of the form [tex]y_p = A sec(x) + B tan(x),[/tex] where A and B are constants.

Taking the first and second derivatives of y_p, we have:

[tex]y_p' = A sec(x)tan(x) + B sec^2(x)[/tex]

[tex]y_p" = A sec(x)tan(x) + 2B sec^2(x)tan(x)[/tex]

Substituting these into the differential equation, we get:

(A sec(x)tan(x) + 2B sec²(x)tan(x)) + (A sec(x) + B tan(x)) = sec(x)tan(x)

Simplifying the equation, we have:

2B sec²(x)tan(x) + B tan(x) = 0

Factoring out B tan(x), we get:

B tan(x)(2 sec²(x) + 1) = 0

Since sec²(x) + 1 = sec²(x)sec²(x), we have:

B tan(x)sec(x)sec²(x) = 0

This equation holds true when B = 0, as tan(x) and sec(x) are non-zero functions. Therefore, the particular solution becomes

[tex]y_p = A sec(x).[/tex]

To find the complementary solution, we solve the homogeneous equation y" + y = 0. The characteristic equation is r² + 1 = 0, which has complex roots r = ±i.

The complementary solution is of the form [tex]y_c = C_1cos(x) + C_2 sin(x)[/tex], where C₁ and C₂ are constants.

The general solution is [tex]y = y_c + y_p = C_1 cos(x) + C_2 sin(x) + A sec(x)[/tex].

Applying the initial conditions y(0) = 1 and y'(0) = 1, we have:

y(0) = C₁ = 1,

y'(0) = -C₁ sin(0) + C₂ cos(0) + A sec(0)tan(0) = C₂ = 1.

Therefore, the values of C₁ and C₂ are 1 and 1, respectively.

Hence, the correct answer is (c) C₁,2 = 1 & 0.

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The symbolization key provides a set of symbols to represent different individuals and relationships. Each English sentence is translated into predicate logic statements using these symbols.

The translations capture the relationships, likes, and compatibility described in the sentences.

Symbolization Key:

- M: Michael Scott

- R: Regional manager

- DMS: Dunder Mifflin Scranton

- DMSf: Dunder Mifflin Stamford

- J: Jim

- P: Pam

- T: Todd

- TO: Toby

- N: Nellie

- A: Angela

- D: Dwight

- Jm: Jim and Pam are married

- Njm: Jim and Pam are not married

- Rf: Right for

- JS: Jan

- MS: Michael Scott

(a) M is the R of DMS, but not of DMSf.

Symbolization: R(M, DMS) ∧ ¬R(M, DMSf)

(b) Neither J nor P likes T, but they both like TO.

Symbolization: ¬(Likes(J, T) ∨ Likes(P, T)) ∧ Likes(J, TO) ∧ Likes(P, TO)

(c) Either both J and P are married, or neither of them are.

Symbolization: (Jm ∧ Pm) ∨ (Njm ∧ ¬Pm)

(d) D and A are Rf each other, but JS isn't Rf MS.

Symbolization: Rf(D, A) ∧ ¬Rf(JS, MS)

(e) J likes P, who likes TO, who likes N.

Symbolization: Likes(J, P) ∧ Likes(P, TO) ∧ Likes(TO, N)

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The required matrix B is[tex][1 3√3 3√69 6√3 0; 2 5√3 6√3 12√3 1; 0 √3 3√69 6√3 0; 1 4√3 6√69 12√3 0; 0 √3 3√69 6√3 1][/tex]based on details in the question.

Given, A =[₁ 19 5 30 -6], and the eigenvalues of A are λ = 4 and λ = 9.We need to find an invertible matrix P which satisfies A = PDP-¹.To find P, we need to find the eigenvectors of A.

A square matrix with an inverse is referred to as an invertible matrix, non-singular matrix, or non-degenerate matrix. An inverse matrix in linear algebra is a matrix that produces the identity matrix when multiplied by the original matrix.

In other words, if matrix A is invertible, then matrix B exists such that matrix A * matrix B * matrix A = identity matrix I. In many mathematical tasks, including the solution of linear equations, computing determinants, and diagonalizing matrices, the inverse of an invertible matrix is essential. It enables the one-of-a-kind solution of systems of linear equations.

We can do that by solving the system (A - λI)x = 0, where I is the identity matrix. For λ = 4, we get(A - 4I)x = 0 =>[tex][ -3 19 5 30 -6 ]x[/tex] = 0. On solving, we get x = [1 2 0 1 0]T.For λ = 9, we get (A - 9I)x = 0 => [ -8 19 5 30 -6 ]x = 0.

On solving, we get x = [1 3 1 2 1]T.So, P =[tex][1 1 3 2 0; 2 2 1 3 1; 0 1 1 0 0; 1 2 2 1 0; 0 1 1 0 1][/tex]is the matrix whose columns are the eigenvectors of A, and D =[tex][4 0 0 0 0; 0 4 0 0 0; 0 0 4 0 0; 0 0 0 9 0; 0 0 0 0 9][/tex] is the diagonal matrix whose entries are the corresponding eigenvalues of A.

Now, we have to use the matrices P and E to find a matrix B which satisfies B² = A.

Given, the matrix E is a 'square root' of the matrix D = [69 3] in the sense that[tex]E² = D. So, E = [√69 0; 0 √3][/tex].

Then, B = [tex]PEP-¹[/tex] = [tex][1 1 3 2 0; 2 2 1 3 1; 0 1 1 0 0; 1 2 2 1 0; 0 1 1 0 1][√69 0; 0 √3][1 1 3 2 0; 2 2 1 3 1; 0 1 1 0 0; 1 2 2 1 0; 0 1 1 0 1]⁻¹[/tex]

= [tex][1 3√3 3√69 6√3 0; 2 5√3 6√3 12√3 1; 0 √3 3√69 6√3 0; 1 4√3 6√69 12√3 0; 0 √3 3√69 6√3 1].[/tex]

Therefore, the required matrix B is [tex][1 3√3 3√69 6√3 0; 2 5√3 6√3 12√3 1; 0 √3 3√69 6√3 0; 1 4√3 6√69 12√3 0; 0 √3 3√69 6√3 1].[/tex]

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The length of the island, to the nearest tenth of a kilometer, is approximately 21.3 km. The other interior angles are approximately 125° each. The ship is approximately 10.65 km away from the port, to the nearest tenth of a kilometer.

A) To find the length of the island, we can use the trigonometric concept of the tangent function. Let's denote the length of the island as L. From the given information, we can set up the following equation:

tan(55°) = L/15

Solving for L, we have: L = 15 * tan(55°)

L ≈ 21.3 km

Therefore, the length of the island, to the nearest tenth of a kilometer, is approximately 21.3 km.

B) The other interior angles of the triangle formed by the ship, one end of the island, and the other end can be found by subtracting 55° from 180° (the sum of angles in a triangle). Let's denote the other two angles as A and B.

A = 180° - 55°

A ≈ 125°

B = 180° - 55°

B ≈ 125°

Therefore, the other interior angles are approximately 125° each.

C) Since the port is in the middle of the island, the distance from the ship to the port is half the length of the island. Thus, the distance from the ship to the port is:

Distance = L/2

Distance ≈ 21.3/2

Distance ≈ 10.65 km

Therefore, the ship is approximately 10.65 km away from the port, to the nearest tenth of a kilometer.

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Given the acceleration function a(t) = -21 + 6k, initial velocity v(0) = -4j, and initial position r(0) = 0, we can find the position at t = 6 by integrating the acceleration to obtain v(t) = -21t + 6tk + C, determining the constant C using v(6), and integrating again to obtain r(t) = -10.5t² + 3tk + Ct + D, finding the constant D using v(6) and evaluating r(6).

To find the velocity vector v(t), we integrate the given acceleration function a(t) = -21 + 6k with respect to time. Since there is no acceleration in the j-direction, the y-component of the velocity remains constant. Therefore, v(t) = -21t + 6tk + C, where C is a constant vector. Plugging in the initial velocity v(0) = -4j, we can solve for the constant C.

Next, to determine the position vector r(t), we integrate the velocity vector v(t) with respect to time. Integrating each component separately, we obtain r(t) = -10.5t² + 3tk + Ct + D, where D is another constant vector.

To find the position at t = 6, we substitute t = 6 into the velocity function v(t) and solve for the constant C. With the known velocity at t = 6, we can then substitute t = 6 into the position function r(t) and solve for the constant D. This gives us the position vector at t = 6, which represents the position of the object at that time.

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74. x₁= 1 and x₂ = -1/2

73. x₁ =  1/2 and x₂ = -1

75. x₁ = (-2 + √31) / 8 and x₂ = (-2 - √31) / 8

77. the discriminant is negative, the solutions are complex numbers.

x = (2 ± 2i) / 2 and x = 1 ± i

76. x₁  = -1/5 and x₂  = -3/5

78. x₁ = -5 + √3 and x₂ = -5 - √3

80. The equation provided, 4x8x², is incomplete and cannot be solved as it is not an equation.

To solve these quadratic equations using the quadratic formula, we'll follow the general format: ax² + bx + c = 0.

2x² - x - 1 = 0:

Using the quadratic formula, where a = 2, b = -1, and c = -1:

x = (-b ± √(b² - 4ac)) / (2a)

x = (-(-1) ± √((-1)² - 4(2)(-1))) / (2(2))

x = (1 ± √(1 + 8)) / 4

x = (1 ± √9) / 4

x = (1 ± 3) / 4

Therefore, the solutions are:

x₁ = (1 + 3) / 4 = 4 / 4 = 1

x₂ = (1 - 3) / 4 = -2 / 4 = -1/2

2x² + x - 1 = 0:

Using the quadratic formula, where a = 2, b = 1, and c = -1:

x = (-b ± √(b² - 4ac)) / (2a)

x = (-(1) ± √((1)² - 4(2)(-1))) / (2(2))

x = (-1 ± √(1 + 8)) / 4

x = (-1 ± √9) / 4

x = (-1 ± 3) / 4

Therefore, the solutions are:

x₁ = (-1 + 3) / 4 = 2 / 4 = 1/2

x₂ = (-1 - 3) / 4 = -4 / 4 = -1

16x² + 8x - 30 = 0:

Using the quadratic formula, where a = 16, b = 8, and c = -30:

x = (-b ± √(b² - 4ac)) / (2a)

x = (-(8) ± √((8)² - 4(16)(-30))) / (2(16))

x = (-8 ± √(64 + 1920)) / 32

x = (-8 ± √1984) / 32

x = (-8 ± √(496 * 4)) / 32

x = (-8 ± 4√31) / 32

x = (-2 ± √31) / 8

Therefore, the solutions are:

x₁ = (-2 + √31) / 8

x₂ = (-2 - √31) / 8

77.2 + 2x - x² = 0:

Rearranging the equation:

x² - 2x + 2 = 0

Using the quadratic formula, where a = 1, b = -2, and c = 2:

x = (-b ± √(b² - 4ac)) / (2a)

x = (-(2) ± √((-2)² - 4(1)(2))) / (2(1))

x = (2 ± √(4 - 8)) / 2

x = (2 ± √(-4)) / 2

Since the discriminant is negative, the solutions are complex numbers.

x = (2 ± 2i) / 2

x = 1 ± i

25x² + 20x + 3 = 0:

Using the quadratic formula, where a = 25, b = 20, and c = 3:

x = (-b ± √(b² - 4ac)) / (2a)

x = (-(20) ± √((20)² - 4(25)(3))) / (2(25))

x = (-20 ± √(400 - 300)) / 50

x = (-20 ± √100) / 50

x = (-20 ± 10) / 50

Therefore, the solutions are:

x₁ = (-20 + 10) / 50 = -10 / 50 = -1/5

x₂ = (-20 - 10) / 50 = -30 / 50 = -3/5

x² + 10x + 22 = 0:

Using the quadratic formula, where a = 1, b = 10, and c = 22:

x = (-b ± √(b² - 4ac)) / (2a)

x = (-(10) ± √((10)² - 4(1)(22))) / (2(1))

x = (-10 ± √(100 - 88)) / 2

x = (-10 ± √12) / 2

x = (-10 ± 2√3) / 2

x = -5 ± √3

Therefore, the solutions are:

x₁ = -5 + √3

x₂ = -5 - √3

4x8x²:

The equation provided, 4x8x², is incomplete and cannot be solved as it is not an equation.

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The point (3,5) in polar coordinates lies in Quadrant I.

In the Cartesian coordinate system, the point (3,5) represents the coordinates (x,y) where x = 3 and y = 5. To determine the quadrant in which the point lies, we can analyze the signs of x and y.

In Quadrant I, both x and y are positive. Since x = 3 and y = 5, which are both positive values, we can conclude that the point (3,5) lies in Quadrant I.

Quadrant I is located in the upper-right portion of the coordinate plane. It is characterized by positive values for both x and y, indicating that the point is situated in the region where x and y are both greater than zero.

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he integral 2cos(θ) dr dθ can be written as the product of two separate integrals: ∫∫R 2cos(θ) dA = ∫(θ = θ1 to θ2) ∫(r = r1 to r2) 2cos(θ) r dr dθ

The given double integral is ∬R 2cos(θ) dA, where R is the region in the polar coordinate system.

To evaluate this integral, we first need to determine the limits of integration. The limits for r should be determined by the region R, while the limits for θ should be determined by the range of θ that covers the region R.

The integral 2cos(θ) dr dθ can be written as the product of two separate integrals:

∫∫R 2cos(θ) dA = ∫(θ = θ1 to θ2) ∫(r = r1 to r2) 2cos(θ) r dr dθ

The limits of integration for r and θ should be determined based on the region R. Once the limits are determined, we can integrate 2cos(θ) with respect to r and then with respect to θ using the appropriate integration techniques.

The final result will depend on the specific limits of integration determined for the region R. By evaluating the integrals using the appropriate techniques, the double integral of 2cos(θ) over the region R can be computed.

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Therefore, a general solution of the given boundary value problem isU(x,t) = ∑ (-8a/π²) [1 - (-1)ⁿ]/n³ sin(nπx/a) sin(αt), n = 1, 2, 3,…

Given that au a² a²u 0x2, t> 0, 0 0 U(x, 0) = x; 0 < x < a U(0, t) = U(a, t) = 0To find: A general solution of the boundary value problem (BVP) by applying the method of separation of variables.

Solution: Suppose U(x,t) = X(x)T(t)Substituting U(x,t) in the given BVP equation, we get;

au X(x)T'(t) + a² X''(x)T(t) + a² X(x)T''(t) = 0at2U(x, 0) = X(x)T(0) = x0 < x < a -------------(1)

U(0, t) = 0 => X(0)T(t) = 0 -------------(2)

U(a, t) = 0 => X(a)T(t) = 0 -------------(3)

Let’s solve T(t) first, as it is much simpler;

au T'(t)/a² T(t) + a² T''(t)/a² T(t) = 0T'(t)/T(t) = -a² T''(t)/au

T(t) = -λ² λ² = -α² => λ = iαT(t) = c1 cos(αt) + c2 sin(αt) --------------(4)

Now we need to solve X(x) using the boundary conditions;

Substitute equation (4) in the BVP equation;

au X(x) [c1 cos(αt) + c2 sin(αt)] + a² X''(x) [c1 cos(αt) + c2 sin(αt)] + a² X(x) [-α²c1 cos(αt) - α²c2 sin(αt)]

= 0X''(x) + (α² - (a²/au)) X(x)

= 0

Let k² = α² - (a²/au)

Then, X''(x) + k² X(x) = 0

The characteristic equation is m² + k² = 0 => m

= ±ki.e.

X(x) = c3 cos(kx) + c4 sin(kx)

Applying the boundary condition X(0)T(t) = 0;X(0)

= c3 cos(0) + c4 sin(0)

= c3

= 0 (from equation 2)X(a) = c4 sin(ka) = 0 (from equation 3)

Since c4 cannot be 0, the only solution is;

ka = nπ => k = nπ/a, n = 1, 2, 3,…

Substituting this in X(x), we get;

Xn(x) = sin(nπx/a), n = 1, 2, 3,…

Therefore, U(x,t) = ∑ Bn sin(nπx/a) sin(αt), n = 1, 2, 3,…where Bn = (2/a) ∫0a x sin(nπx/a) dx

We know that U(x,0) = x;U(x,0) = ∑

Bn sin(nπx/a) = x

Bn = (2/a) ∫0a x sin(nπx/a) dx= (4a/nπ) [(-1)ⁿ¹-1]/n²= (-8a/π²) [1 - (-1)ⁿ]/n³

Now, U(x,t) = ∑ (-8a/π²) [1 - (-1)ⁿ]/n³ sin(nπx/a) sin(αt), n = 1, 2, 3,…

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As n approaches infinity, the function tends towards (5/3)sex.

The correct option is A:

[tex]$\int_{0}^{3}x dx = \frac{5}{3}$[/tex].

Given expression: [tex]$1 + \lim_{n \to \infty} \sum_{i=1}^{n} \left[1+\left(\frac{i}{n}\right)^2\right]\cdot\left(\frac{2}{n}\right)$[/tex]

Simplifying the expression, we have:

[tex]$\sum_{i=1}^{n} \left[1+\left(\frac{i}{n}\right)^2\right]\cdot\left(\frac{2}{n}\right) = \frac{2}{n} \sum_{x=0}^{1} \left[1+x^2\right]dx$[/tex]

Replacing the variable and limits, we get:

[tex]$\sum_{i=1}^{n} \left[1+\left(\frac{i}{n}\right)^2\right]\cdot\left(\frac{2}{n}\right) = \frac{2}{n} \left[x+\frac{x^3}{3}\right] \bigg|_{x=0}^{x=1}$[/tex]

[tex]$\sum_{i=1}^{n} \left[1+\left(\frac{i}{n}\right)^2\right]\cdot\left(\frac{2}{n}\right) = \frac{2}{n} \left[1+\frac{1}{3}\right] = \frac{4}{3}$[/tex]

Putting the value in the original expression, we have:

[tex]$1 + \lim_{n \to \infty} \sum_{i=1}^{n} \left[1+\left(\frac{i}{n}\right)^2\right]\cdot\left(\frac{2}{n}\right) = 1 + \frac{4}{3} \cdot (2-1) = \frac{5}{3}$[/tex]

Now, comparing the options:

Option A: [tex]$\int_{0}^{3}x dx = \frac{5}{3}$[/tex]

Option B: [tex]$\int_{0}^{e} dx \neq \frac{5}{3}$[/tex]

Option C: [tex]$\int_{1}^{e^{x}} dx \neq \frac{5}{3}$[/tex]

Option D: [tex]$\int_{1}^{3} x dx \neq \frac{5}{3}$[/tex]

Therefore, the correct option is A: [tex]$\int_{0}^{3}x dx = \frac{5}{3}$[/tex].

Therefore, the correct option is A, which is n Sexdx. This means that as n approaches infinity, the function tends towards (5/3)sex.

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the equation for the line, parallel to the given line and passing through the point (-5, -1), is y = x + 4 in slope-intercept form.To find an equation for a line parallel to the given line and passing through the point (-5, -1), we can use the fact that parallel lines have the same slope.

The given line has the equation y - 5 = x - 3. By rearranging this equation, we can determine its slope-intercept form:

y = x - 3 + 5
y = x + 2

The slope of the given line is 1, since the coefficient of x is 1. Therefore, the parallel line will also have a slope of 1.

Using the point-slope form with the point (-5, -1) and slope 1, we can write the equation of the line:

y - (-1) = 1(x - (-5))
y + 1 = x + 5
y = x + 4

Thus, the equation for the line, parallel to the given line and passing through the point (-5, -1), is y = x + 4 in slope-intercept form.

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The volume is changing at a rate of 135.9 cm³/minute

The radius of the spherical balloon is given as `r = 7.8 cm`.

Its rate of change is given as

`dr/dt = 0.7 cm/min`.

We need to find the rate of change of volume `dV/dt` when `r = 7.8 cm`.

We know that the volume of the sphere is given by

`V = (4/3)πr³`.

Therefore, the derivative of the volume function with respect to time is

`dV/dt = 4πr² (dr/dt)`.

Substituting `r = 7.8` and `dr/dt = 0.7` in the above expression, we get:

dV/dt = 4π(7.8)²(0.7) ≈ 135.88 cubic cm/min

Therefore, the volume is changing at a rate of approximately 135.9 cubic cm/min.

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From the implicit function given, the value of dy/dx is -35 / (1 - 2x) when dy = -1, dz = -3, and the given values are substituted.

To find the derivative dy/dx, we can differentiate the given equation implicitly with respect to x while treating y and z as functions of x.

ln(x + y + z) = x + 2y + 3z

Differentiating both sides with respect to x:

(1/(x + y + z)) * (1 + dy/dx + dz/dx) = 1 + 2dy/dx + 3dz/dx

We are given dz/dx = -3, and we want to find dy/dx.

Substituting the given values:

(1/(x + y + z)) * (1 + dy/dx - 3) = 1 + 2dy/dx - 9

Multiplying both sides by (x + y + z) to eliminate the fraction:

1 + dy/dx - 3(x + y + z) = (x + y + z)(1 + 2dy/dx - 9)

1 + dy/dx - 3x - 3y - 3z = x + y + z + 2xy/dx - 9x - 9y - 9z

Collecting like terms:

-12x - 13y - 11z + 1 + dy/dx = 2xy/dx - 8y - 8z

Rearranging and isolating dy/dx:

dy/dx - 2xy/dx = -12x - 13y - 11z - 8y - 8z + 1

dy/dx(1 - 2x) = -12x - 21y - 19z + 1

dy/dx = (-12x - 21y - 19z + 1) / (1 - 2x)

Now, we can substitute the values dy = -1, dz = -3, and the given values of x, y, and z into the equation to find dy/dx.

dy/dx = (-12x - 21y - 19z + 1) / (1 - 2x)

      = (-12(-1) - 21(5) - 19(-3) + 1) / (1 - 2x)

      = (12 - 105 + 57 + 1) / (1 - 2x)

      = -35 / (1 - 2x)

Therefore, the value of dy/dx is -35 / (1 - 2x) when dy = -1, dz = -3, and the given values are substituted.

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The solution set is {-b/a}.

1. The solution set is { }. (Simplify your answer.)

Given equation is 3x/9 + 2 = 2x - x + 3 - 9x/9

Let's simplify the given equation by using the following steps:

Step 1: Combine like terms to get 3x/9 + 2 + 9x/9 = 2x - x + 3

Step 2: Combine like terms to get 3x/9 + 9x/9 = x + 5

Step 3: Simplify the above equation to get x = 5

The solution set is {5}.

2. The solution set is {}. (Simplify your answer.)

Given equation is 6t + 4/2 = t + 6 - 6t - 5/2

Let's simplify the given equation by using the following steps:

Step 1: Combine like terms to get 6t + 2t = t + 6 - 9t/2 - 5/2

Step 2: Combine like terms to get 8t = (2t + 7)/2 + 12/2

Step 3: Simplify the above equation to get 16t = 2t + 7 + 12

Step 4: Simplify the above equation to get 14t = 19

Step 5: Simplify the above equation to get t = 19/14

The solution set is {}.

3. The solution set is {-2, 2}. (Simplify your answer.)

Given equation is 4/(x - 2) - 5/(x + 2) = 25/(x - 2)(x + 2)

Let's simplify the given equation by using the following steps:

Step 1: Multiply the whole equation by (x - 2)(x + 2) to get 4(x + 2) - 5(x - 2) = 25

Step 2: Simplify the above equation to get 4x + 3x = 55

Step 3: Simplify the above equation to get x = -2, 2

The solution set is {-2, 2}.

4. The solution set is { }. (Simplify your answer.)

Given equation is x(x + 3) - 4/2x = 2x - 2x + 4

Let's simplify the given equation by using the following steps:

Step 1: Multiply the whole equation by 2x to get x^2 + 3x - 2x^2 = 4x

Step 2: Simplify the above equation to get -x^2 + 3x = 4x

Step 3: Simplify the above equation to get -x^2 = x

Step 4: Simplify the above equation to get x(x + 1) = 0

Step 5: Simplify the above equation to get x = 0, -1

The solution set is {}.5. The solution set is { -b/a }. (Simplify your answer.)

Given equation is (a + b)x = c

Let's simplify the given equation by using the following steps:

Step 1: Divide both sides of the equation by (a + b) to get x = c/(a + b)

The solution set is {-b/a}.

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A rock concert at 110 dB is significantly louder than a normal conversation at 60 dB, with a difference of 50 dB.

According to the given statement, 90 decibels is twice as loud as 80 decibels.

Therefore, on a relative logarithmic scale, the difference between 90 dB and 80 dB is +10 dB (doubling of the loudness).

Similarly, 110 dB is ten times as loud as 100 dB, and ten times as loud as 90 dB (using the same rule). Thus, on a relative logarithmic scale, the difference between 110 dB and 60 dB is +50 dB.

Thus, a rock concert at 110 dB is 50 dB louder than a regular conversation at 60 dB.

In conclusion, a rock concert at 110 dB is significantly louder than a normal conversation at 60 dB, with a difference of 50 dB.

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To evaluate the limit as x approaches a of (x+4a)² - 25a² / (x-a), we can simplify the expression and then substitute the value a into the resulting expression.The resulting expression is 2a² / 0. Since the denominator is 0, the limit is undefined.

Let's simplify the expression (x+4a)² - 25a² / (x-a) by expanding the numerator and factoring the denominator: [(x+4a)(x+4a) - 25a²] / (x-a) Simplifying further, we have: [(x² + 8ax + 16a²) - 25a²] / (x-a) Combining like terms, we get: (x² + 8ax + 16a² - 25a²) / (x-a)

Now, let's substitute the value a into the expression: (a² + 8a(a) + 16a² - 25a²) / (a-a) Simplifying this further, we have: (a² + 8a² + 16a² - 25a²) / 0 Combining the terms, we get: (25a² - 16a² - 8a² + a²) / 0 Simplifying the expression, we have: 2a² / 0 Since the denominator is 0, the limit is undefined.

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The interval of convergence for the power series is (-3, 13). This means that the series will converge for any value of x within the open interval (-3, 13).

The interval of convergence can be determined using the ratio test. Applying the ratio test to the given power series, we take the limit as n approaches infinity of the absolute value of the ratio of the (n+1)th term to the nth term. The ratio test states that if this limit is less than 1, the series converges; if it is greater than 1, the series diverges; and if it is equal to 1, the test is inconclusive.

In this case, considering the term of the power series, we have In(n)(x - 5) as the nth term. Taking the ratio of the (n+1)th term to the nth term and simplifying, we get the expression (n+1)/n * |x - 5|. Since the series converges, we want the limit of this expression to be less than 1. By considering the limit of (n+1)/n as n approaches infinity, we find that it approaches 1. Therefore, to satisfy the condition, |x - 5| must be less than 1. This gives us the interval of convergence as (-3, 13), meaning the series converges for any x value within this interval.

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The difference scheme 2 [ƒ(z+3h) + ƒ(z − h) — 2ƒ(z)] approximates the second derivative of ƒ(z) with respect to z, and its error order is O(h²).

The given difference scheme is an approximation of the second derivative of ƒ(z) using a finite difference method. By evaluating the scheme at different points, specifically z+3h, z − h, and z, and applying the corresponding coefficients, the second derivative can be approximated. The coefficient values in the scheme are derived based on the Taylor series expansion of the function.

The error order of the scheme indicates how the error in the approximation behaves as the step size (h) decreases. In this case, the error order is O(h²), which means that as the step size is halved, the error decreases by a factor of four. It implies that the approximation becomes more accurate as the step size becomes smaller.

It's important to note that the error order is an estimate and may vary depending on the specific properties of the function being approximated and the choice of difference scheme.

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To solve the given differential equation, y" + 6y' = [tex]2x^4[/tex] + [tex]x^2e^{-3x}[/tex] + sin(x) using the method of undetermined coefficients, the final solution is the sum of the particular solution and the complementary solution.

The given differential equation is y" + 6y' = [tex]2x^4[/tex] + [tex]x^2e^{-3x}[/tex] + sin(x) .

To find the particular solution, we assume a particular solution in the form of a polynomial multiplied by exponential and trigonometric functions. In this case, we assume a particular solution of the form [tex]y_p = (Ax^4 + Bx^2)e^{-3x} + Csin(x) + Dcos(x).[/tex]

Next, we take the first and second derivatives of [tex]y_p[/tex] and substitute them into the differential equation. By equating coefficients of like terms, we can determine the values of the undetermined coefficients A, B, C, and D.

After finding the particular solution, we solve the homogeneous equation associated with the differential equation, which is obtained by setting the right-hand side of the equation to zero. The homogeneous equation is y" + 6y' = 0, and its solution can be found by assuming a solution of the form [tex]y_c = e^{rx}[/tex], where r is a constant.

Finally, the general solution of the differential equation is given by[tex]y = y_p + y_c[/tex], where [tex]y_p[/tex] is the particular solution and [tex]y_c[/tex] is the complementary solution.

Note: The specific values of the undetermined coefficients and the complementary solution were not provided in the question, so the final solution cannot be determined without further information.

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r^2 - 6r + 9 - 150 / e^(rt) = 0 is the solution . We need to find the solution of this second-order linear homogeneous differential equation with the initial conditions y(0) = 2 and y'(0) = 3.

Taking the derivatives of y, we have y' = re^(rt) and y" = r^2e^(rt).

Substituting these derivatives into the differential equation, we get:

r^2e^(rt) - 6re^(rt) + 9e^(rt) = 150.

Factoring out e^(rt), we have:

e^(rt)(r^2 - 6r + 9) = 150.

Since e^(rt) is never equal to zero, we can divide both sides of the equation by e^(rt):

r^2 - 6r + 9 = 150 / e^(rt).

Simplifying further, we have:

r^2 - 6r + 9 - 150 / e^(rt) = 0.

This is a quadratic equation in terms of r. Solving for r using the quadratic formula, we find two possible values for r.

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Partial fraction expansion as:

(x³+ 10x²+ 25x) = A / x + B / (x + 5) + C / (x + 5)²

Again, A, B, and C are constants that we need to determine.

Let's break down the partial fraction expansions for the given functions:

(a) 7x / [(x + 2)(3x + 4)]

To find the partial fraction expansion of this expression, we need to factor the denominator first:

(x + 2)(3x + 4)

Next, we express the expression as a sum of partial fractions:

7x / [(x + 2)(3x + 4)] = A / (x + 2) + B / (3x + 4)

Here, A and B are constants that we need to determine.

(b) (x³ + 10x² + 25x)

Since this expression is a polynomial, we don't need to factor anything. We can directly write its partial fraction expansion as:

(x³+ 10x²+ 25x) = A / x + B / (x + 5) + C / (x + 5)²

Again, A, B, and C are constants that we need to determine.

Remember that the coefficients A, B, and C are specific values that need to be determined by solving a system of equations.

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The signed area between the graph of y = x² - 2 and the x-axis, over the interval [1, 3], can be determined by integrating the function from x = 1 to x = 3. The area is equal to -6.333 square units.

To find the signed area between the graph of y = x² - 2 and the x-axis over the interval [1, 3], we need to integrate the function from x = 1 to x = 3. The integral represents the accumulation of infinitesimally small areas between the curve and the x-axis.

The integral can be expressed as follows: ∫[1,3] (x² - 2) dx Evaluating this integral gives us the signed area between the curve and the x-axis over the interval [1, 3]. Using the power rule for integration, we can integrate each term separately: ∫[1,3] (x² - 2) dx = [(1/3)x³ - 2x] [1,3]

Substituting the upper and lower limits of integration, we get: [(1/3)(3)³ - 2(3)] - [(1/3)(1)³ - 2(1)]

= [9 - 6] - [1/3 - 2]

= 3 - (1/3 - 2)

= 3 - (-5/3)

= 3 + 5/3

= 14/3

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