halp me this question test

The probability density function f(x) for a uniform random variable X defined over the interval [2, 10] is:
d. None of these choices.

Step 1: Identify the interval limits, a and b.
a = 2, b = 10

Step 2: Calculate the width of the interval.
Width = b - a = 10 - 2 = 8

Step 3: Determine the probability density function for a uniform distribution.
f(x) = 1 / (b - a)

Step 4: Substitute the values of a and b in the formula.
f(x) = 1 / (10 - 2)

Step 5: Simplify the expression.
f(x) = 1 / 8 = 0.125

So, the correct answer is none of these choices (d).

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Answer:

Step-by-step explanation:

0.7 cubic kilometers

V= lwh

V=(.5)(2)(.7)

The answers are as follows

A: [tex]-2.3^{x-1} = a^{2} (r^{x-1} )\\[/tex]

∴[tex]y = a(-2.3)^{x}[/tex]

The constant ratio is [tex]-2,3[/tex] and the y-intercept is [tex](0,a)[/tex].

B: [tex]45.2^{x-1} = a(r^{x-1} )[/tex]

∴[tex]y = a(45.2)^{x}[/tex]

The constant ratio is [tex]45.2[/tex] and the y-intercept is [tex](0,a)[/tex].

C: [tex]1234-0.1^{x-1}[/tex] [tex]= a r^{x-1}[/tex]

∴  [tex]y = a(0.1)^{x} + 1234[/tex]

The constant ratio is [tex]0.1[/tex] and the y-intercept is[tex](0,a +1234)[/tex].

D: [tex]-5(1/2)^{x-1}[/tex] is not a geometric sequence as there is no common ratio between consecutive terms.

The constant term is [tex]-5[/tex] and the y-intercept is [tex](0,-5)[/tex].

An exponential function is a mathematical function in the form [tex]f(x) = a^{x}[/tex], where a is a positive constant called the base, and x is the variable. These functions have a constant ratio between consecutive outputs.

An explicit formula for a geometric sequence as an exponential function, we can write the nth term as[tex]a(r^{n-1})[/tex], where a is the first term and r is the common ratio.

This is equivalent to the general form of an exponential function, [tex]y = ab^{x}[/tex], where a is the initial value and b is the base. The constant ratio between consecutive terms is equal to the base of the exponential function.

Therefore,

A: [tex]-2.3^{x-1} = a^{2} (r^{x-1} )\\[/tex]

∴[tex]y = a(-2.3)^{x}[/tex]

The constant ratio is [tex]-2,3[/tex] and the y-intercept is [tex](0,a)[/tex].

B: [tex]45.2^{x-1} = a(r^{x-1} )[/tex]

∴[tex]y = a(45.2)^{x}[/tex]

The constant ratio is [tex]45.2[/tex] and the y-intercept is [tex](0,a)[/tex].

C: [tex]1234-0.1^{x-1}[/tex] [tex]= a r^{x-1}[/tex]

∴  [tex]y = a(0.1)^{x} + 1234[/tex]

The constant ratio is [tex]0.1[/tex] and the y-intercept is[tex](0,a +1234)[/tex].

D: [tex]-5(1/2)^{x-1}[/tex] is not a geometric sequence as there is no common ratio between consecutive terms.

The constant term is [tex]-5[/tex] and the y-intercept is [tex](0,-5)[/tex].

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Answer:

$365.00.

Step-by-step explanation:

Answer:

[tex]\textsf{Greatest sum}=25.1=25\frac{1}{10}[/tex]

[tex]\textsf{Greatest difference}=30.9=30\frac{9}{10}[/tex]

[tex]\textsf{Greatest product}=122.1=122\frac{1}{10}[/tex]

[tex]\textsf{Greatest quotient}=2.8\overline{03}=2\frac{53}{66}[/tex]

Step-by-step explanation:

First, rewrite each number as an improper fraction with the common denominator of 10.

[tex]6.6=\dfrac{66}{10}[/tex]

[tex]-4\frac{3}{5}=-\dfrac{4 \cdot 5+3}{5}=-\dfrac{23}{5}=-\dfrac{23 \cdot 2}{5 \cdot 2}=-\dfrac{46}{10}[/tex]

[tex]18\frac{1}{2}=\dfrac{18 \cdot 2+1}{2}=\dfrac{37}{2}=\dfrac{37\cdot 5}{2\cdot 5}=\dfrac{185}{10}[/tex]

[tex]-12.4=-\dfrac{124}{10}[/tex]

Now order the improper fractions from smallest to largest:

[tex]-\dfrac{124}{10},\;\;-\dfrac{46}{10},\;\;\dfrac{66}{10},\;\;\dfrac{185}{10}[/tex]

The greatest sum can be found by adding the largest two numbers:

[tex]\implies \dfrac{66}{10}+\dfrac{185}{10}=\dfrac{66+185}{10}=\dfrac{251}{10}=25.1=25\frac{1}{10}[/tex]

The greatest difference can be found by subtracting the smaller number from the largest number:

[tex]\implies \dfrac{185}{10}-\left(-\dfrac{124}{10}\right)=\dfrac{185+124}{10}=\dfrac{309}{10}=30.9=30\frac{9}{10}[/tex]

The greatest product can be found by multiplying the largest two numbers:

[tex]\implies \dfrac{66}{10}\cdot \dfrac{185}{10}=\dfrac{66\cdot 185}{10 \cdot 10}=\dfrac{12210}{100}=122.1=122\frac{1}{10}[/tex]

The greatest quotient can be found by dividing the largest number by the smallest number, given the two numbers have the same sign.

[tex]\implies \dfrac{185}{10} \div \dfrac{66}{10}= \dfrac{185}{10} \cdot \dfrac{10}{66}=\dfrac{185}{66}=2\frac{53}{66}[/tex]

[tex]\hrulefill[/tex]

Rewrite all the numbers as decimals:

[tex]6.6[/tex]

[tex]-4\frac{3}{5}=-4.6[/tex]

[tex]18\frac{1}{2}=18.5[/tex]

[tex]-12.4[/tex]

Now order the decimals from smallest to largest:

[tex]-12.4, \;\; -4.6, \;\;6.6,\;\;18.5[/tex]

The greatest sum can be found by adding the largest two numbers:

[tex]\begin{array}{rr}&6.6\\+&18.5\\\cline{2-2} &25.1\\ \cline{2-2}&^1^1\;\;\;\end{array}[/tex]

The greatest difference can be found by subtracting the smallest number from the largest number:

[tex]18.5-(-12.4)=18.5+12.4[/tex]

[tex]\begin{array}{rr}&18.5\\+&12.4\\\cline{2-2} &30.9\\ \cline{2-2}&^1\;\;\;\;\end{array}[/tex]

The greatest product can be found by multiplying the largest two numbers:

[tex]\begin{array}{rr}&18.5\\\times&6.6\\\cline{2-2} &11.10\\+&111.00\\ \cline{2-2}&122.10\end{array}[/tex]

The greatest quotient can be found by dividing the largest number by the smallest number, given the two numbers have the same sign.

[tex]\implies \dfrac{18.5}{6.6}=\dfrac{185}{66}=2.8\overline{03}[/tex]

Expression is not equal to zero, we cannot find a vector field G such that curl G = (xyz, -y⁶z⁵, y⁵z⁶). Therefore, the answer is no.

There is no such G because the divergence of curl G is not equal to zero. The divergence of curl G is given by the scalar triple product identity:

div(curl G) = dot(grad, curl G)

Using this identity and the given components of curl G, we have:

div(curl G) = x(∂/∂x)(-y⁶z⁵) + y(∂/∂y)(y⁵z⁶) + z(∂/∂z)(xyz)
div(curl G) = -6xy⁵z⁵ + 5y⁶z⁵ + xz

Since this expression is not equal to zero, we cannot find a vector field G such that curl G = (xyz, -y⁶z⁵, y⁵z⁶). Therefore, the answer is no.

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Answer:

use Pythagorean theorem

Step-by-step explanation:

:)

a^2+b^2=c^2 if equal triangle is right!

Answer:

7. No.  8. Yes.

Step-by-step explanation:

Use the pythagorean theorem.

[tex]a^{2} + b^2 = c^2[/tex]

Where a and b are legs and c is the hypotenuse.

7.

[tex]3^2 + 7^2 \neq \sqrt{57}^2 \\9 + 49 = 58 \neq 57[/tex]

So it isn't a right triangle.

8.

[tex](5\sqrt{5})^2 = 11^2 + 2^2\\(\sqrt{125})^2 = 121 + 4\\125 = 125[/tex]

So this is a right triangle.

If n is a vector normal to the tangent plane of the surface F(x,y,z) = 0 at a point, then option (C) the gradient of F is orthogonal to n.

The gradient of F at a point (x₀, y₀, z₀) is defined as the vector (∂F/∂x, ∂F/∂y, ∂F/∂z) evaluated at that point. This gradient vector is perpendicular (or orthogonal) to the level surface of F passing through that point.

The tangent plane to the surface F(x, y, z) = 0 at a point (x₀, y₀, z₀) is defined as the plane that touches the surface at that point and is perpendicular to the normal vector at that point.

Thus, if n is a vector normal to the tangent plane of the surface F(x, y, z) = 0 at a point (x₀, y₀, z₀), then n is perpendicular to the tangent plane. Since the gradient vector of F at the point (x₀, y₀, z₀) is perpendicular to the tangent plane, it is also perpendicular to n.

Therefore, the correct answer is (C) The gradient of F is orthogonal to n.

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If we are given the quantity (p-1)(q-1), we can use it to factor n=pq. This is because of the relationship between Euler's totient function and the prime factors of n.

Specifically, if we know (p-1)(q-1), we can calculate the value of Euler's totient function for n as follows:

φ(n) = (p-1)(q-1)

We can then use this value to find the prime factors of n. One way to do this is to use the fact that for any prime factor p of n, we have:

n = p^k * m, where m is not divisible by p.

Then, we can use Euler's totient function to calculate the value of φ(n) as:

φ(n) = (p-1) * p^(k-1) * φ(m)

By substituting the value we calculated earlier for φ(n), we can solve for p and q:

φ(n) = (p-1)(q-1) = pq - (p+q) + 1

Solving for p and q using the quadratic formula gives:

p = (p+q) / 2 + sqrt((p+q)^2 / 4 - n)
q = (p+q) / 2 - sqrt((p+q)^2 / 4 - n)

Therefore, if we are given the quantity (p-1)(q-1), we can use it to calculate the value of Euler's totient function for n, and then use that to find the prime factors p and q of n.

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We have shown that |2S| = 2|S| for all finite sets S, by induction on the size of S.

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The interval would be wider, with more plausible values, and the margin of error would be larger.

What is confidence interval ?

A confidence interval is a statistical range of values that is used to estimate an unknown population parameter, such as the mean or standard deviation of a distribution, based on a sample of data.

a) The confidence interval captures the plausible range of values for the population mean waist circumference of adult women in the United States. More specifically, it is the range of values that is likely to contain the true population mean with 95% confidence.

b) The confidence interval can be expressed as: "We are 95% confident that the true population mean waist circumference of adult women in the United States falls between 99.8 and 102.0 centimeters."

c) The margin of error for this confidence interval can be calculated by taking half the width of the interval. Therefore, the margin of error is (102.0 - 99.8) : 2 = 1.1. Thus, we can express the confidence interval as "The estimate is 100.9 centimeters plus or minus 1.1 centimeters."

d) A 99% confidence interval based on the same data would be larger than the 95% confidence interval. This is because a 99% confidence level requires a wider interval to capture the true population mean with 99% confidence.

Therefore, the interval would be wider, with more plausible values, and the margin of error would be larger.

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The trigonometric identity [sint + cost]²/sin(t)cos(t) = 2 + csc(t)sec(t).

Trigonometric identities are mathematical equations that contain trigonometric ratios.

Since we have the trigonometric identity

[sint + cost]²/sin(t)cos(t) = 2 + csc(t)sec(t). We want to show that the left-hand-side L.H.S = right-hand-side R.H.S. We proceed as folows

Since we have L.H.S = [sint + cost]²/sin(t)cos(t), so expanding the numerator, we have that

[sint + cost]²/sin(t)cos(t), = [sin²t + 2sintcost + cos²(t)]/sin(t)cos(t)

Using the trigonometric identity sin²t + cos²t = 1, we have that

[sin²t + 2sintcost + cos²(t)]/sin(t)cos(t) =  [sin²t + cos²(t) + 2sintcost]/sin(t)cos(t)

=  [1 + 2sintcost]/sin(t)cos(t)

Dividing through by the denominator sin(t)cos(t) , we have that

[1 + 2sintcost]/sin(t)cos(t) = [1/sin(t)cos(t) + [2sintcost]/sin(t)cos(t)

= 1/sin(t) × `1/cos(t) + 2

= cosec(t)sec(t) + 2  [since cosec(t) = 1/sin(t) and sec(t) = 1/cos(t)]

= 2 +  cosec(t)sec(t)

= R.H.S

Since L.H.S = R.H.S

So, the trigonometric identity [sint + cost]²/sin(t)cos(t) = 2 + csc(t)sec(t).

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(a) The ball is 3 feet high when it leaves the child's hand.                      

(b) The maximum height of the ball is 75 feet.

(c) The ball strikes the ground approximately 91.6 feet from the child

(a) To find the height of the ball moving in a projectile motion when it leaves the child's hand, we need to substitute x = 0 into the equation and solve for y:

[tex]y = -1/16(0)^2 + 6(0) + 3[/tex]

y = 3

Therefore, the ball is 3 feet high when it leaves the child's hand.

(b) To find the maximum height of the ball, we need to find the vertex of the parabola defined by the equation. The x-coordinate of the vertex is given by:

x = -b / (2a)

where a = -1/16 and b = 6. Substituting these values, we get:

x = -6 / (2(-1/16)) = 48

The y-coordinate of the vertex is given by:

[tex]y = -1/16(48)^2 + 6(48) + 3 = 75[/tex]

Therefore, the maximum height of the ball is 75 feet.

(c) To find how far from the child the ball strikes the ground, we need to find the value of x when y = 0 (since the ball will be at ground level when its height is 0).

Substituting y = 0 into the equation, we get:

[tex]0 = -1/16x^2 + 6x + 3[/tex]

Multiplying both sides by -16 to eliminate the fraction, we get:

[tex]x^2 - 96x - 48 = 0[/tex]

Using the quadratic formula, we can solve for x:

[tex]x = [96 \ ^+_- \sqrt{(96^2 - 4(-48))}]/2\\x = [96\ ^+_- \sqrt{(9408)}]/2\\x = 48 \ ^+_- \sqrt{(2352)[/tex]

x ≈ 4.4 or x ≈ 91.6

Since the ball is thrown from x = 0, we can discard the negative solution and conclude that the ball strikes the ground approximately 91.6 feet from the child.

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Answer:

Set your calculator to degree mode.

Please draw the figure to confirm my answer.

[tex] \tan( \alpha ) = \frac{15}{24} [/tex]

[tex] \alpha = {tan}^{ - 1} \frac{5}{8} = 32 \: degrees[/tex]

So the angle of elevation is 32°.

D is the correct answer.

Answer:

Step-by-step explanation:

The arithmetic mean of 18 and 128 is (18+128)/2 = 73.

The geometric mean of 18 and 128 is the square root of their product: √(18*128) = √(2304) = 48.

So, the difference between the geometric mean and the arithmetic mean is:

48 - 73 = -25.

Therefore, the difference of the geometric mean and the arithmetic mean of 18 and 128 is -25.

If -ve root of G is taken then
                                  G = -48
and diff of G and A will be  -48 - 73 = -121

Answer:

x = 12

Step-by-step explanation:

{22, 14, 12}

2x = 24

2(22) = 44

2(14) = 28

2(12) = 24

The linear differential operator that annihilates [tex]e^{-x} + 2xe^x - x^2e^x is (D - 2)(D - 1)(D + 1).[/tex]

For [tex]1+6x - 2x^3:[/tex]

The first derivative is [tex]6 - 6x^2[/tex], and the second derivative is -12x. Since the second derivative is a constant multiple of the original function, we can use the differential operator D - 2 to annihilate the function:

[tex](D - 2)(1 + 6x - 2x^3) = D(1 + 6x - 2x^3) - 2(1 + 6x - 2x^3)[/tex]

[tex]= (6 - 6x^2) - 2 - 12x + 4x^3 - 2[/tex]

[tex]= 4x^3 - 6x^2 - 12x + 4[/tex]

[tex]For e^{-x} + 2xe^x - x^2e^x:[/tex]

The first derivative is [tex]2e^x - 2xe^x - x^2e^x,[/tex] and the second derivative is [tex]-2e^x + 2xe^x + 2e^x - 2xe^x - 2xe^x - x^2e^x[/tex]. Simplifying, we get:

[tex](D - 2)(D - 1)(D + 1)(e^{-x} + 2xe^x - x^2e^x) = (D - 1)(D + 1)(2e^x - 2xe^x - x^2e^x)[/tex]

[tex]= (D + 1)(2e^x - 4xe^x - 2xe^x + 2x^2e^x - x^2e^x)[/tex]

[tex]= (D + 1)(2e^x - 6xe^x + 2x^2e^x)[/tex]

Therefore, the linear differential operator that annihilates [tex]e^{-x} + 2xe^x - x^2e^x is (D - 2)(D - 1)(D + 1).[/tex]

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The area of the region with polar coordinates R = {(x, y) | x² + y² ≤ 100, x ≥ 6} is approximately 197.39 square units.

To calculate the area, first, rewrite the given inequalities in polar coordinates: r² ≤ 100 and rcos(θ) ≥ 6. Next, find the bounds for r and θ. Since r² ≤ 100, r must be between 0 and 10.

For the second inequality, rcos(θ) ≥ 6, divide by r (assuming r ≠ 0) to get cos(θ) ≥ 6/r. To satisfy this inequality, θ must be between arccos(6/r) and π for r in [6, 10].

Now, integrate the area using polar coordinates with the following formula: A = 0.5 * ∫(from 6 to 10) ∫(from arccos(6/r) to π) (r^2) dθ dr. After evaluating the integral, you get the area A ≈ 197.39 square units.

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To find a 95% confidence interval for the mean surgery time for this procedure, you need to use the following formula:

CI = X-bar ± (t * (s / √n))

where:
- CI is the confidence interval
- X-bar is the sample mean
- t is the t-score, which corresponds to the desired confidence level (95%) and the degrees of freedom (n-1)
- s is the sample standard deviation
- n is the sample size

1. Calculate the sample mean (X-bar), sample standard deviation (s), and sample size (n).
2. Find the appropriate t-score using a t-table or calculator for 95% confidence level and (n-1) degrees of freedom.
3. Plug the values into the formula and calculate the interval.
4. Round the answers to two decimal places.

The 95% confidence interval for the mean surgery time is (lower limit, upper limit). Make sure to provide the specific values for your data in the formula.

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complete question:

find a 95 confidence interval for the mean surgery time for this procedure. what quantities do you need to calculate the 95 confidence interval ?

The shortest distance the joggers must travel to return to their starting point is 7.81 miles.

To find the shortest distance the joggers must travel to return to their starting point, we can use the Pythagorean theorem, as the southward and eastward distances form a right triangle. The theorem states that the square of the length of the hypotenuse (the shortest distance, in this case) is equal to the sum of the squares of the other two sides:

a^2 + b^2 = c^2

Here, a is the southward distance (6 miles), and b is the eastward distance (5 miles). We need to find c, the hypotenuse.

(6 miles)^2 + (5 miles)^2 = c^2

36 + 25 = c^2

61 = c^2

Now, take the square root of both sides to find c:

c = √61

c ≈ 7.81 miles

The equation that can be used to determine the total amount y that Susan paid is [tex]y=14x+9[/tex]. The Option B is correct.

To calculate the total amount paid by Susan at the supermarket, we need to add the cost of all the items she bought.

From the given information, we know that:

We can use the equation y = $14x + $9, where y represents the total amount paid by Susan and x represents the pounds of meat which can be multiplied.

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The value of x in the quadrilateral is 4.

We are given that;

Four angles of quadrilateral 5x, 102, 4y-12, 3x+8

Now,

The sum of all interior angles of quadrilateral is 360degree

So, 5x + 102 + 4y-12 + 3x+8 = 360

Also opposite angles are equal

5x= 3x+8

2x=8

x=4

Therefore, by the properties of quadrilateral the answer will be 4.

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We need to determine the probabilities for the given scenarios. Probability is a branch of mathematics that deals with the study of random events or phenomena.

Here's the step-by-step explanation:
1. At most 200: This means x ≤ 200, including x = 200. Since x has 148 possible values, and all of them are less than or equal to 200, the probability, in this case, is 1 (all possible outcomes are included).

2. Less than 200: This means x < 200, not including x = 200. Since x has 148 possible values and all of them are less than 200, the probability is also 1 (all possible outcomes are included).

3. At least 200: This means x ≥ 200, including x = 200. Since there are no values of x in the given range that are greater than or equal to 200, the probability, in this case, is 0 (no possible outcomes are included).

So, the probabilities for the given scenarios are:
- At most 200: 1.0000 (rounded to four decimal places)
- Less than 200: 1.0000 (rounded to four decimal places)
- At least 200: 0.0000 (rounded to four decimal places)

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Answer: Your answer is B.

Step-by-step explanation: y > x means y is bigger than x and also -8 means that you subtract 8 from x so its B

Answer: both

Step-by-step explanation:

The required answer is E(X) = 1.4

The expected value E(X) for this distribution can be calculated by multiplying each possible value of X by its probability, and then adding up these products. Using the table provided, we have:

E(X) = (0)(0.2) + (1)(0.3) + (2)(0.4) + (3)(0.1) = 0 + 0.3 + 0.8 + 0.3 = 1.4

Therefore, the closest option to our calculated expected value is option A, 1.2. However, none of the given options match exactly with our calculation.

To find the expected value E(X) of the discrete random variable X, we need the probability distribution table for X. However, the table is not provided in the question. Please provide the table with the probabilities for each possible value of X, and I will be happy to help you calculate the expected value E(X).

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The limit of the sequence an = [(ln(n))²]/(3n) using L'Hôpital's Rule is 0.

We can apply L'Hôpital's Rule to find the limit of the given sequence:

an = [(ln(n))²]/(3n)

Taking the derivative of the numerator and denominator with respect to n:

an = [2 ln(n) * (1/n)] / 3

Simplifying:

an = (2/3) * (ln(n)/n)

Now taking the limit as n approaches infinity:

lim n->∞ an = lim n->∞ (2/3) * (ln(n)/n)

We can again apply L'Hôpital's Rule:

lim n->∞ (2/3) * (ln(n)/n) = lim n->∞ (2/3) * (1/n) = 0

Therefore, the limit of the sequence is 0.

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a. The standard equation for an ellipse with center at the origin and major axis horizontal is:

x^2/a^2 + y^2/b^2 = 1

where a is the length of the semi-major axis and b is the length of the semi-minor axis. The eccentricity e is related to a and b by the equation:

e = √(a^2 - b^2)/a

We are given that the eccentricity e is 0.60 and the length of the major axis is 48 inches. Since the major axis is horizontal, a is half of the length of the major axis, so a = 24. We can solve for b using the equation for eccentricity:

0.6 = √(24^2 - b^2)/24

0.6 * 24 = √(24^2 - b^2)

14.4^2 = 24^2 - b^2

b^2 = 24^2 - 14.4^2

b ≈ 16.44

Therefore, the equation of the ellipse is:

x^2/24^2 + y^2/16.44^2 = 1

b. To find the maximum height of the sign, we need to find the length of the semi-minor axis, which is the distance from the center of the ellipse to the top or bottom edge of the sign. We can use the equation for the ellipse to solve for y when x = 0:

0^2/24^2 + y^2/16.44^2 = 1

y^2 = 16.44^2 - 16.44^2 * (0/24)^2

y ≈ 13.26

Therefore, the maximum height of the sign is approximately 26.52 inches (twice the length of the semi-minor axis).