Usain thinks of a two-digit number. He adds 11 and then divides by 3. The answer is 22. What number did he start with?​

According to Descartes' rule of signs, the maximum possible number of positive roots of a polynomial is equal to the number of sign changes in the coefficients of its terms, or less than that by an even number.

In the given polynomial function f(x) = 5x^4 - 5x^3 - 2x^2 - 5x + 8, there are two sign changes in the coefficients, from positive to negative after the second term and from negative to positive after the third term.

Therefore, the maximum possible number of positive roots of this polynomial is either 2 or 0 (less than 2 by an even number).

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The series Σn=1 sin^2(n)/n^8 diverges.

To use the direct comparison test, we need to find a series with positive terms that is smaller than the given series and either converges or diverges. We can use the fact that sin^2(n) <= 1 to get:

0 <= sin^2(n)/n^8 <= 1/n^8

Now, we know that the series Σn=1 1/n^8 converges by the p-series test (since p=8 > 1). Therefore, by the direct comparison test, the series Σn=1 sin^2(n)/n^8 also converges.

However, the inequality we used above is not strict, so we can't use the direct comparison test to show that the series diverges. In fact, we can show that the series does diverge by using the following argument:

Consider the partial sums S_k = Σn=1^k sin^2(n)/n^8. Note that sin^2(n) is periodic with period 2π, and that sin^2(n) >= 1/2 for n in the interval [kπ, (k+1/2)π). Therefore, we can lower bound the sum of sin^2(n)/n^8 over this interval as follows:

Σn=kπ^( (k+1/2)π) sin^2(n)/n^8 >= (1/2)Σn=kπ^( (k+1/2)π) 1/n^8

Using the integral test (or comparison with a Riemann sum), we can show that the sum on the right-hand side is infinite. Therefore, the sum on the left-hand side is also infinite, and the series Σn=1 sin^2(n)/n^8 diverges.

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Laplace used this model to study the probability of the sun rising tomorrow by considering each day as a "ball" with "sunrise" or "no sunrise" as colors.

(a) Let R_i denote drawing a red ball on the ith turn. The probability that the (N+1)th ball is red given the first N balls were red is P(R_(N+1)|R_1, R_2, ..., R_N). By Bayes' theorem:
P(R_(N+1)|R_1, ..., R_N) = P(R_1, ..., R_N|R_(N+1)) * P(R_(N+1)) / P(R_1, ..., R_N)
Since drawing balls is with replacement, the probability of drawing a red ball on any turn from the ith urn is (i-1)/(N+1). Thus, P(R_(N+1)|R_1, ..., R_N) = ((i-1)/(N+1))^N * (i-1)/(N+1) / ((i-1)/(N+1))^N = (i-1)/(N+1)
(b) The probability that the first ball is red is the sum of the probabilities of drawing a red ball from each urn, weighted by the probability of selecting each urn: P(R_1) = (1/(N+1)) * Σ[((i-1)/(N+1)) * (1/(N+1))] for i = 1 to N+1
Similarly, the probability that the second ball is red:
P(R_2) = (1/(N+1)) * Σ[((i-1)/(N+1))^2 * (1/(N+1))] for i = 1 to N+1

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The polynomial that represents the volume of the room in standard form is x³ + 20x² + 10x + 144 cubic units.

In Mathematics and Geometry, the volume of a rectangular prism can be calculated by using the following formula:

Volume of a rectangular prism = L × W × H

Where:

By substituting the given dimensions (side lengths) into the formula for the volume of this rectangular room, we have the following;

Volume of rectangular room = (x + 6) × (x + 12) ×  (x + 2)

Volume of rectangular room = x³ + 20x² + 10x + 144 cubic units.

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It takes 1 second for the penny to land on the ground after being dropped from a height of 16 feet.

To find the time it takes for the penny to land on the ground after being dropped from a height of 16 feet, we can use the equation of motion for free fall:

h = (1/2)gt²

Where:

h is the height (16 feet in this case)

g is the acceleration due to gravity (32.2 feet per second squared)

t is the time we want to find

Plugging in the values, we have:

16 = (1/2)(32.2)t²

Simplifying:

32 = 32.2t²

Dividing both sides by 32.2:

t² = 1

Taking the square root of both sides:

t = ±1

Since time cannot be negative, we take the positive value:

t = 1

Therefore, it takes 1 second for the penny to land on the ground after being dropped from a height of 16 feet.

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The approximate solution rounded to six decimal places is x ≈ -0.030387.

(a) To find the exact solution in terms of logarithms, we'll use the property of logarithms that allows us to rewrite an exponential equation in logarithmic form. For our equation, we can take the natural logarithm (base e) of both sides:
-6x = ln(5)
Now, we can solve for x by dividing both sides by -6:
x = ln(5) / -6
This is the exact solution in terms of logarithms.
(b) To find an approximation of the solution rounded to six decimal places, use a calculator to compute the natural logarithm of 5 and divide the result by -6:
x ≈ ln(5) / -6 ≈ 0.182321 / -6 ≈ -0.030387
 

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To find the height of the kite from the ground, we can use trigonometry and the given information.

Let's consider the right triangle formed by the kite string, the height of the kite, and the ground. The length of the kite string is the hypotenuse of the triangle, which is 80 units, and the angle between the kite string and the ground is 75 degrees.

Using the trigonometric function sine (sin), we can relate the angle and the sides of the right triangle:

sin(angle) = opposite / hypotenuse

In this case, the opposite side is the height of the kite, and the hypotenuse is the length of the kite string.

sin(75°) = height / 80

Now we can solve for the height by rearranging the equation:

height = sin(75°) * 80

Using a calculator, we find:

height ≈ 76.21

Therefore, the height of the kite from the ground is approximately 76.21 units.

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The limit of ln x × 3√x as x approaches infinity is negative infinity.

To calculate this limit, we can use L'Hôpital's rule:

limx→∞ ln x × 3√x

= limx→∞ (ln x) / (1 / (3√x))

We can now apply L'Hôpital's rule by differentiating the numerator and denominator with respect to x:

= limx→∞ (1/x) / (-1 / [tex](9x^{(5/2)[/tex]))

= limx→∞[tex]-9x^{(3/2)[/tex]

As x approaches infinity, [tex]-9x^{(3/2)[/tex]approaches negative infinity, so the limit is:

limx→∞ ln x × 3√x = -∞

Therefore, the limit of ln x × 3√x as x approaches infinity is negative infinity.

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To solve the initial value problem y" +9y = 8(t – 37) + cos 3t using the Laplace Transform, we first take the Laplace Transform of both sides:

L{y"} + 9L{y} = 8L{t-37} + L{cos 3t}

Using the properties of Laplace Transform, we can simplify this expression to:

s^2Y(s) - sy(0) - y'(0) + 9Y(s) = 8(1/s^2) - 8(37/s) + (s/(s^2+9))

Substituting y(0) = 0 and y'(0) = k, we get:

s^2Y(s) - k + 9Y(s) = 8/s^2 - 296/s + (s/(s^2+9))

Solving for Y(s), we get:

Y(s) = (8/s^2 - 296/s + (s/(s^2+9)) + k)/(s^2+9)

To express this as a piecewise-defined function, we can use partial fraction decomposition and inverse Laplace Transform. The solution will have two parts: a homogeneous solution and a particular solution. The homogeneous solution is Yh(s) = Asin(3t) + Bcos(3t), while the particular solution is Yp(s) = (8/s^2 - 296/s + (s/(s^2+9))). Adding these two solutions and taking inverse Laplace Transform, we get:

y(t) = (8/9) - (37/3)cos(3t) + (1/9)sin(3t) + ke^(-3t/3)

Where k = y'(0). Thus, the solution to the initial value problem is a piecewise-defined function with two parts: a homogeneous solution and a particular solution, expressed in terms of sine, cosine, and exponential functions.

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The volume of the cylinder is 164.85 ft³.

We have the dimension of cylinder

Radius = 15/2 =7 .5 ft

Height = 7 ft

Now, the formula for Volume of Cylinder is

= 2πrh

Plugging the value of height and radius we get

Volume of Cylinder is

= 2πrh

= 2 x 3.14 x 7.5/2 x 7

=  3.14 x 7.5 x 7

= 164.85 ft³

Thus, the volume of the cylinder is 164.85 ft³.

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The function f(x) = 3x^4 - 6x^2 + 7 has a local maximum at x = 0 and local minimums at x = ±√(2/3).

The given function f(x) = 3x^4 - 6x^2 + 7 is a polynomial of degree four. To determine the local extrema, we can use the first derivative test.

Taking the derivative of f(x) with respect to x, we get f'(x) = 12x^3 - 12x. To find critical points, we set f'(x) equal to zero and solve for x:

12x^3 - 12x = 0

12x(x^2 - 1) = 0

x(x + 1)(x - 1) = 0

From this equation, we find three critical points: x = 0, x = -1, and x = 1.

Now, we can analyze the sign of the derivative in the intervals (-∞, -1), (-1, 0), (0, 1), and (1, +∞) to determine the nature of the extrema.

For x < -1, the derivative is negative, indicating that f(x) is decreasing in this interval. For -1 < x < 0, the derivative is positive, meaning that f(x) is increasing. In the interval 0 < x < 1, the derivative is negative, and for x > 1, the derivative becomes positive again.

Based on the first derivative test, we can conclude that f(x) has a local maximum at x = 0 and local minimums at x = ±√(2/3).

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The approximate number of degrees in angle b, given that tan b = 1.732, is approximately 60 degrees.

To find the angle b, we can use the inverse tangent function, also known as arctan or tan^(-1), on the given value of 1.732 (the tangent of angle b).

Using a scientific calculator, we can input the value 1.732 and apply the arctan function. The result will be the angle in radians. To convert the angle to degrees, we can multiply the result by (180/π) since there are π radians in 180 degrees.

By performing these calculations, we find that arctan(1.732) is approximately 1.047 radians.

Multiplying this by (180/π) yields approximately 59.999 degrees, which can be rounded to approximately 60 degrees. Therefore, the approximate number of degrees in angle b is 60 degrees.

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To find real numbers a and b such that the equation (a - 3)(b + 2i) = 8 + 4i is true, we need to equate the real and imaginary parts of both sides of the equation separately. By solving the resulting equations, we can determine the values of a and b.

Let's first expand the left side of the equation:

(a - 3)(b + 2i) = ab + 2ai - 3b - 6i.

Equating the real parts, we have:

ab - 3b = 8.

Equating the imaginary parts, we have:

2ai - 6i = 4i.

From the first equation, we can rewrite it as:

b(a - 3) = 8.

Since we're looking for real numbers a and b, we know that the imaginary parts (ai and i) should cancel out. Therefore, the second equation simplifies to:

-4 = 0.

However, this is a contradiction since -4 is not equal to 0. Therefore, there are no real numbers a and b that satisfy the equation (a - 3)(b + 2i) = 8 + 4i

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The given function h(t) = -16[tex]t^2[/tex] + 48t + 160 represents the height, in feet, of an object at time t seconds after it is launched from the top of a 160-foot tall building.

The function h(t) = -16[tex]t^2[/tex]+ 48t + 160 is a quadratic function that models the height of the object. The term -16[tex]t^2[/tex] represents the effect of gravity, as it causes the object to fall downward with increasing time. The term 48t represents the initial upward velocity of the object, which counteracts the effect of gravity. The constant term 160 represents the initial height of the object, which is the height of the building.

By evaluating the function for different values of t, we can determine the height of the object at any given time. For example, if we substitute t = 0 into the function, we get h(0) = -16[tex](0)^2[/tex] + 48(0) + 160 = 160, indicating that the object is initially at the height of the building. As time progresses, the value of t increases and the height of the object changes according to the quadratic function.

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The Pythagorean identity is a trigonometric identity that relates the three basic trigonometric functions - sine, cosine, and tangent - in a right triangle.

Given that tan(θ) = 7/24 and θ is in Quadrant I, we can use the Pythagorean identity to find the value of cos(θ):

cos²(θ) = 1 - sin²(θ)

Since sin(θ) = tan(θ)/√(1 + tan²(θ)), we have:

sin(θ) = 7/25

cos²(θ) = 1 - (7/25)² = 576/625

cos(θ) = ±24/25

Since θ is in Quadrant I, we have cos(θ) > 0, so:

cos(θ) = 24/25

To find csc(θ), we can use the reciprocal identity:

csc(θ) = 1/sin(θ) = 25/7

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The sum of 502.07 and 1.4 is 503.47. (option c)

To add decimal numbers, we align the decimal points and add the corresponding digits from right to left. If there are any missing places after the decimal point, we assume they are zero.

=> 502.07 + 1.4

Align the decimal points.

502.07

1.40

Add the digits from right to left.

Starting from the rightmost column (the hundredths place), we have 7 + 0, which equals 7.

Moving to the next column (the tenths place), we have 0 + 4, which equals 4.

In the next column (the ones place), we have 2 + 1, which equals 3.

Finally, in the leftmost column (the hundreds place), we have 5 + 0, which equals 5.

Write the sum.

502.07

1.40

503.47

Therefore, the sum of 502.07 and 1.4 is 503.47. (option c).

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Approximately 15% was saved on the rain boots.Given a pair of rain boots that cost $45, but on sale, was reduced to $38.25.To find the percent saved

we'll use the following formula:Percent saved = (Amount saved / Original price) × 100 Amount saved = Original price - Sale price Amount saved = $45 - $38.25Amount saved = $6.75

Now, we can find the percent saved as follows :Percent saved = (Amount saved / Original price) × 100Percent saved

To calculate the percentage saved on the rain boots, you can use the following formula:

Percentage Saved = ((Original Price - Sale Price) / Original Price) * 100

Given: Original Price = $45

Sale Price = $38.25

Using the formula:

Percentage Saved = ((45 - 38.25) / 45) * 100

Percentage Saved = (6.75 / 45) * 100

Percentage Saved ≈ 0.15 * 100

Percentage Saved ≈ 15%

Therefore, approximately 15% was saved on the rain boots.

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Using the Pythagorean theorem, we can find the length of the diagonal fence:

diagonal²= length² + width²

diagonal²= 120² + 75²

diagonal² = 14400 + 5625

diagonal²= 20025

diagonal = √20025

diagonal =141.5 feet

Therefore, approximately 141.5 feet of fencing are needed to make a diagonal fence for the lot. Rounded to the nearest foot, the answer is 142 feet.

The correct answer is D. No, because the vertical scale exaggerates the differences between brands.

Step 1: Examine the information presented in the graph. The graph shows the strength of three paper towel brands: Brand X, Brand Y, and Brand Z. The strength values are represented on the y-axis, ranging from 90 to 100 with increments of 5.

Step 2: Compare the strength values of the brands. According to the graph, Brand X has a strength of 100, Brand Y has a strength of 105, and Brand Z has a strength of 110.

Step 3: Evaluate the claim made by the makers of Brand Z. They claim that Brand Z is twice as strong as Brand X.

Step 4: Assess the accuracy of the claim. Based on the actual strength values provided in the graph, Brand Z is not exactly twice as strong as Brand X. The difference in strength between the two brands is only 10 units.

Therefore, the claim made by the makers of Brand Z is not supported by the graph. The graph does not show a clear indication that Brand Z is twice as strong as Brand X. The vertical scale of the graph exaggerates the differences between the brands, leading to a potential misinterpretation of the data. Therefore, it is not valid to agree with the claim based solely on the information provided in the graph.

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To convert x and y screen coordinates to a one-dimensional coordinate, you can use a formula like:

1D_coordinate = y * screen_width + x

where y is the vertical screen coordinate (starting from 0 at the top), x is the horizontal screen coordinate (starting from 0 at the left), and screen_width is the total width of the screen in pixels.

This formula assumes that the x and y coordinates are measured in pixels and that the screen is a rectangular shape. The resulting 1D coordinate represents a unique position on the screen and can be used to index into an array or buffer containing data associated with the screen.

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The mean of X is y, and the variance of X is also y.

To find the mean and variance of the random variable X, which follows a Poisson distribution with parameter y, we need to use the relationship between the exponential distribution and the Poisson distribution.

Given that Y follows an exponential distribution with parameter λ, we know that the probability density function (PDF) of Y is:

f_Y(y) = λ * e^(-λy) for y ≥ 0

To find the mean of X, denoted as E(X), we can use the property of the exponential distribution that states the mean of an exponential random variable with parameter λ is equal to 1/λ. Therefore, we have:

E(Y) = 1/λ

Now, let's consider X, which follows a Poisson distribution with parameter y. The mean of a Poisson random variable is equal to its parameter. Hence:

E(X) = y

To find the variance of X, denoted as Var(X), we use the relationship between the exponential and Poisson distributions. The variance of an exponential distribution is given by 1/λ^2, and for a Poisson distribution, the variance is equal to its parameter. Therefore:

Var(Y) = (1/λ)^2

Var(X) = y

So, the mean of X is y, and the variance of X is also y.

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The area of the surface of the cap cut from the paraboloidz S ≈ 13.4952

We need to find the surface area of the cap cut from the paraboloid by the cone.

The equation of the paraboloid is z = 12 - 2x^2 - 2y^2.

The equation of the cone is z = √x^2 + y^2.

To find the cap, we need to find the intersection of these two surfaces. Substituting the equation of the cone into the equation of the paraboloid, we get:

√x^2 + y^2 = 12 - 2x^2 - 2y^2

Simplifying and rearranging, we get:

2x^2 + 2y^2 + √x^2 + y^2 - 12 = 0

Letting u = x^2 + y^2, we can rewrite this equation as:

2u + √u - 12 = 0

Solving for u using the quadratic formula, we get:

u = (3 ± √21)/2

Since u = x^2 + y^2, we know that the cap is a circle with radius r = √u = √[(3 ± √21)/2].

To find the surface area of the cap, we need to integrate the expression for the surface area element over the cap. The surface area element is given by:

dS = √(1 + fx^2 + fy^2) dA

where fx and fy are the partial derivatives of z with respect to x and y, respectively. In this case, we have:

fx = -4x/(√x^2 + y^2)

fy = -4y/(√x^2 + y^2)

So, the surface area element simplifies to:

dS = √(1 + 16(x^2 + y^2)/(x^2 + y^2)) dA

dS = √17 dA

Since the cap is a circle, we can express dA in polar coordinates as dA = r dr dθ. So, the surface area of the cap is given by:

S = ∫∫dS = ∫∫√17 r dr dθ

Integrating over the circle with radius r = √[(3 ± √21)/2], we get:

S = ∫0^2π ∫0^√[(3 ± √21)/2] √17 r dr dθ

S = 2π √17/3 [(3 ± √21)/2]^(3/2)

Simplifying and approximating to four decimal places, we get:

S ≈ 13.4952

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Comparing the values of δz and dz, we have:

δz - dz = 8.9957 - (-0.75) ≈ 9.7457

Since δz - dz is positive, we can conclude that δz is greater than dz.

To compare the values of δz and dz, we can use the partial derivative of z with respect to x and y, and the given change in x and y:

∂z/∂x = 2x - y

∂z/∂y = -x - 14y^2

At the point (1, -1), we have:

∂z/∂x = 2(1) - (-1) = 3

∂z/∂y = -(1) - 14(-1)^2 = -15

Using the formula for total differential:

dz = (∂z/∂x)dx + (∂z/∂y)dy

Substituting the given change in x and y, we get:

dz = (3)(-0.04) + (-15)(0.05) = -0.75

Therefore, dz = -0.75.

To find δz, we can use the formula:

δz = z(0.96, -0.95) - z(1, -1)

Substituting the given points into the function z, we get:

z(0.96, -0.95) = (0.96)^2 - (0.96)(-0.95) - 7(-0.95)^2 ≈ 1.9957

z(1, -1) = 1^2 - 1(-1) - 7(-1)^2 = -7

Substituting these values into the formula, we get:

δz = 1.9957 - (-7) = 8.9957

Therefore, δz = 8.9957.

Comparing the values of δz and dz, we have:

δz - dz = 8.9957 - (-0.75) ≈ 9.7457

Since δz - dz is positive, we can conclude that δz is greater than dz.

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To complete the table of values for the rational function f(x) = 8x/(x-4), we need to plug in different values of x and evaluate the function.

x | f(x)
--|----
-3| 24
-2| -16
0 | 0
2 | 16
4 | undefined
6 | -24
Let me explain how I arrived at each value. When x=-3, we get f(-3) = 8(-3)/(-3-4) = 24. Similarly, when x=-2, we get f(-2) = 8(-2)/(-2-4) = -16. When x=0, we get f(0) = 8(0)/(0-4) = 0. When x=2, we get f(2) = 8(2)/(2-4) = 16. However, when x=4, we get f(4) = 8(4)/(4-4) = undefined, since we cannot divide by zero. Finally, when x=6, we get f(6) = 8(6)/(6-4) = -24.I hope this helps you understand how to evaluate a rational function for different values of x. Let me know if you have any other questions!

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The approximate solutions to the equation cos x = -0.60 for the domain 0° ≤ x ≤ 360° are 53° and 307°.

First, we need to identify the angles for which the cosine function is equal to -0.60.

We can use a calculator or reference table to find that the cosine of 53° is approximately -0.60.

However, we need to check if 53° is within the given domain of 0° ≤ x ≤ 360°.

Since 53° is within this range, it is a possible solution to the equation.

Next, we need to check if there are any other angles within the domain that satisfy the equation.

To do this, we can use the periodicity of the cosine function, which means that the cosine of an angle is equal to the cosine of that angle plus a multiple of 360°. In other words,

if cos x = -0.60 for some angle x within the domain, then

cos (x + 360n) = -0.60 for any integer n.

We can use this property to find any other possible solutions to the equation by adding or subtracting multiples of 360° from our initial solution of 53°.

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Answer:

Rational

Step-by-step explanation:

It would be a decimal

Note that the mountain would be as tall (height) as 4 kilometers. This si solved using Pythagorean principles.

Here we used the Pythagorean principle to solve this.

Note that he mountain takes the shape of a triangle.

Since we have the base to be 3 kilometers and the hypotenuse ot be 5 kilometers,

Lets call the height y

3² + y² = 5²

9+y² = 25

y^2 = 25 = 9

y² = 16

y = 4

thus, it is correct to state that the height of the mountain is 4  kilometers.


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To prove that there exists a value x between a and b such that f(x) = 0 when f(a)f(b) < 0, we can use the Intermediate Value Theorem.

The Intermediate Value Theorem states that if a function f is continuous on a closed interval [a, b] and f(a) and f(b) have opposite signs, then there exists at least one value c in the interval (a, b) such that f(c) = 0.

Given that f is a real-valued continuous function on the real numbers, we can apply the Intermediate Value Theorem to prove the existence of a value x between a and b where f(x) = 0.

Since f(a) and f(b) have opposite signs (f(a)f(b) < 0), it means that f(a) and f(b) lie on different sides of the x-axis. This implies that the function f must cross the x-axis at some point between a and b.

Therefore, by the Intermediate Value Theorem, there exists at least one value x between a and b such that f(x) = 0.

This completes the proof.

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To evaluate the integral of the function 2(6x - 6)(4x²+ 9)dx from 0, follow these steps:

1. Rewrite the given function: The integral is ∫[2(6x - 6)(4x² + 9)]dx.

2. Distribute the 2 into the parentheses: ∫[12x(4x² + 9) - 12(4x² + 9)]dx.

3. Expand the integrand: ∫[48x³ + 108x - 48x² - 108]dx.

4. Combine like terms: ∫[48x³ - 48x² + 108x - 108]dx.

5. Integrate term by term:

  ∫48x³dx = (48/4)x⁴ = 12x⁴
  ∫-48x²dx = (-48/3)x³ = -16x³
  ∫108xdx = (108/2)x² = 54x²
  ∫-108dx = -108x

6. Combine the integrated terms: 12x⁴ - 16x³ + 54x²- 108x + C, where C is the constant of integration.

Since the given problem does not provide limits of integration, the final answer is the indefinite integral:

The integral of 2(6x - 6)(4x² + 9)dx is 12x⁴ - 16x³+ 54x² - 108x + C.

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The slope of each of the table is:

A. m = 7/8;  B. m = -9;  C. m = 15;  D. m = 1/2;  E. m = -4/5;   F. m = 0

The slope is also the rate of change of a table which is: change in y / change in x. To find the slope, you can make use of any two pairs of values given in the table to find the rate of change of y over the rate of change of x.

A. slope (m) = change in y/change in x = 7 - 0 / 8 - 0

m = 7/8.

B. slope (m) = change in y/change in x = 4 - 49 / 0 - (-5)

m = -9

C. slope (m) = change in y/change in x = 7.5 - 0 / 0.5 - 0

m = 15

D. slope (m) = change in y/change in x = 7 - 6 / 2 - 0

m = 1/2

E. slope (m) = change in y/change in x = -6 - (-2) / 5 - 0

m = -4/5

F. slope (m) = change in y/change in x = 3 - 3 / 2 - 1

m = 0

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