What is the domain of g(x,y) = 1/xy ?

Answer:

177.5 units

Step-by-step explanation:

Let's denote the width of the cocoa farm as "w" and the length as "l". We know that the perimeter of a rectangle is the sum of all its sides, so we can set up the following equation:

2l + 2w = 497

We also know that the length is 5/2 times the width, so we can write:

l = (5/2)w

We can substitute this expression for "l" into the first equation and solve for "w":

2(5/2)w + 2w = 497

5w + 2w = 497

7w = 497

w = 71

So the width of the cocoa farm is 71. To find the length, we can use the expression we derived earlier:

l = (5/2)w = (5/2) * 71 = 177.5

Therefore, the length of the cocoa farm is 177.5.

The OLS assumption most likely violated by omitted variables bias is: E(μ₁|X₁) = 0.

Omitted variables bias occurs when a relevant variable is left out of the regression model, leading to biased and inconsistent estimates. This violates the OLS assumption that the expected value of the error term, given the independent variable (E(μ₁|X₁)), is equal to zero.

When omitted variables bias is present, the error term captures the effect of the omitted variable, resulting in a non-zero expected value of the error term conditional on the independent variable. This can cause misleading inferences and incorrect conclusions about the relationships between the variables in the model.

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The greatest rate of comparison is from Hayley and least is from Natelie.

Comparison is the act of examining two or more things or entities to determine their similarities and differences. It involves analyzing the characteristics, features, or qualities of two or more things in order to make comparisons or draw conclusions.

According to the given information:

Given that, a table shows the part of the students in each grade that participated in a sport this year, we need to find the least and greatest participant was from which grade.

So, Anna rate of participation = 1/5 = 0.2

Haley rate of participation = 20.2% = 20.2/100 = 0.202

Natalia rate of participation = 0.19

On comparison from each of them, the participant from Haley is the most and participant from Natalia is the least.

Hence, the least participant is from Natalia and the greatest is from Haley.

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The probability cannot be negative, there must be an error in the given information. So, the correct answer is:
f) None of the above.

We are given the following probabilities: P(A) = 17/50, P(B) = 17/25, and P(A ∪ Bc) = 2/5. We are asked to find P(A ∩ Bc).

Using the formula for the union of two events: P(A ∪ Bc) = P(A) + P(Bc) - P(A ∩ Bc)

Since Bc is the complement of B, we have P(Bc) = 1 - P(B) = 1 - (17/25) = 8/25.

Now we can plug in the given probabilities into the formula:
2/5 = (17/50) + (8/25) - P(A ∩ Bc)

To solve for P(A ∩ Bc), we first find a common denominator for the fractions, which is 50. So, we have:
20/50 = (17/50) + (16/50) - P(A ∩ Bc)

Combine the fractions:
20/50 = 33/50 - P(A ∩ Bc)

Subtract 33/50 from both sides to isolate P(A ∩ Bc):
P(A ∩ Bc) = -13/50

Since the probability cannot be negative, there must be an error in the given information. So, the correct answer is:
f) None of the above.

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The solution is, simplification of the expression 6(5+5i) / (-2i) (3i⁵) is:

-5 - 5i.

Here, we have,

given that,

the expression is:

6(5+5i) / (-2i) (3i⁵)

now, we have to simplify this expression.

we know that,

i² = 1

so, (i²)³ = 1²

or, i⁶ = 1

we have,

6(5+5i) / (-2i) (3i⁵)

=30 + 30i / (-6i⁶)

=6(5+5i) / -6 * 1

=(5+5i) / -1

= - (5+5i)

= -5 - 5i

Hence, The solution is, simplification of the expression 6(5+5i) / (-2i) (3i⁵) is: -5 - 5i.

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Answer:

=25

Step-by-step explanation:

Perimeter of a square = 4L

20 = 4L

divide both sides by 4

L = 5[ length is 5cm]

Area of a square = L*L

Area = 5cm times 5cm

Area = 25cm^2

The sample size needed for the sampling distribution of sample proportions to have a standard deviation of 0.02 is approximately 628 children.



The formula for the standard deviation of the sampling distribution of sample proportions is:
[tex]σp = sqrt[p(1-p)/n][/tex]

Where p: population proportion (0.49 in this case) and n: sample size.

We are given that σp = 0.02. So, we can set up the equation:
[tex]0.02 = sqrt[0.49(1-0.49)/n][/tex]

Simplifying:
0.0004 = 0.24/n
n = 0.24/0.0004
n = 627.5 = 628

However, this is only an estimate because the sample size must be a whole number. Since we cannot have a fractional sample size, we round up to the nearest whole number:

n = 628

To calculate the sample size (n) needed to achieve a standard deviation of 0.02 for the sampling distribution of sample proportions, we'll use the formula:

[tex]Standard Deviation = sqrt[(P * (1 - P)) / n][/tex]

where P: proportion of children that catch a cold while at school (0.49), and n: sample size we want to find. We're given the desired standard deviation as 0.02. Now, let's solve for n:

[tex]0.02 = sqrt[(0.49 * (1 - 0.49)) / n][/tex]

Square both sides to get rid of the square root:
0.0004 = (0.49 * 0.51) / n

Now, solve for n:

n = (0.49 * 0.51) / 0.0004
n = 627.75

Since we can't have a fraction of a child, we'll round up to ensure the standard deviation is no greater than 0.02:

n = 628 children

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The calculated test statistic z = -0.56 is not in the rejection region, we fail to reject the null hypothesis H0: p = 0.30.

(a) The test statistic for testing the null hypothesis H0: p = 0.30 against the alternative hypothesis Ha: p ≠ 0.30 using the sample proportion p = 0.285 is given by:

z = (p - μ) / (σ / sqrt(n))

where μ = 0.30, σ = sqrt(μ(1-μ)/n) = sqrt(0.30(0.70)/400) = 0.027,

and n = 400.

Substituting the values, we get:

z = (0.285 - 0.30) / (0.027)

z = -0.56 (rounded to two decimal places)

(b) The p-value is the probability of getting a test statistic as extreme as the observed, assuming the null hypothesis is true. Since this is a two-tailed test, we need to find the probability of getting a z-score less than -0.56 or greater than 0.56, given a standard normal distribution.

Using a standard normal table or calculator, we find that the probability of getting a z-score less than -0.56 is 0.2881, and the probability of getting a z-score greater than 0.56 is also 0.2881. Therefore, the p-value is the sum of these probabilities:

p-value = P(z < -0.56 or z > 0.56) = 0.2881 + 0.2881 = 0.5762 (rounded to four decimal places)

(c) The rejection rule using the critical value depends on the level of significance α and the type of test (one-tailed or two-tailed). Assuming a two-tailed test with α = 0.05, the critical values for the test statistic are ±1.96, which are obtained from a standard normal table or calculator.

Therefore, the rejection rule is:

if z ≤ -1.96 or z ≥ 1.96, reject H0.

Otherwise, fail to reject H0.

Since the calculated test statistic z = -0.56 is not in the rejection region, we fail to reject the null hypothesis H0: p = 0.30.

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The value of the fourth term f(4) in the sequence is 0

From the question, we have the following parameters that can be used in our computation:

If f(1) = 2, f(2) = 4

f(n)=2f (n - 1) - 2f (n - 2)

Using the given recursive formula, we can find the value of f(3) and f(4) by working backwards:

f(3) = 2f(2) - 2f(1) = 2(4) - 2(2) = 8 - 4 = 4

f(4) = 2f(3) - 2f(2) = 2(4) - 2(4) = 8 - 8 = 0

Therefore, f(4) = 0.

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Answer:

kite

4x + 1 = 17 6y - 3 = 21

4x = 16 6y = 24

x = 4 y = 4

The volume of the region bounded by the two paraboloids is 32π/5 cubic units.

To find the volume of the region bounded by the two paraboloids, we need to determine the limits of integration for each variable.

Since the two paraboloids intersect in a curve, we can use this curve as a boundary to split the region into two parts.

First, let's find the curve of intersection by setting the two equations equal to each other:

[tex]12 - x^2 - y^2 = 2x^2 + 2y^2\\10x^2 + 10y^2 = 12\\x^2 + y^2 = 6/5[/tex]

This is the equation of a circle with center at the origin and radius [tex]\sqrt{(6/5)[/tex]

So we can use cylindrical coordinates to integrate over this region.

The limits for z are from the lower paraboloid to the upper paraboloid:

[tex]2x^2 + 2y^2 \leq z\leq 12 - x^2 - y^2[/tex]

In cylindrical coordinates, we have:

[tex]0 \leq r \leq \sqrt{(6/5)}\\0 \leq \theta \leq 2\pi \\2r^2 \leq z \leq 12 - r^2[/tex]

So the volume of the region is given by the triple integral:

V = ∫∫∫ dz r dr dθ

where the limits of integration are as described above. Therefore, we have:

[tex]V = \int\limits^{2\pi }_0 {\int\limits^{\sqrt{6/5}}_0 {\int\limits^{12-r^2}_{2r^2} \, dz}\ r \, dr } \, d\theta[/tex]

Evaluating the integral, we get:

V = 32π/5

Therefore, the volume of the region bounded by the two paraboloids is 32π/5 cubic units.

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The values of t, when the ball's height is 15 feet, are 0.42 and 1.33.

What is a quadratic equation?

Any equation in algebra that can be written in the standard form where x stands for an unknown value, where a, b, and c stand for known values, and where a 0 is true is known as a quadratic equation.

Here, we have

Given: A ball is thrown from an initial height of 6 feet with an initial upward velocity of 28 ft/s.

The ball's height, h (in feet), after t seconds is given by the following:

h = 6 + 28t - 16t²

When h = 15, we have

15 = 6 + 28t - 16t²

6 + 28t - 16t² - 15 = 0

-16t² + 28t + 6 - 15 = 0

-16t² + 28t - 9 = 0

16t² - 28t + 9 = 0

Using a graphing tool, we have:

t = 0.42 and 1.33

Hence, the values of t when the ball's height is 15 feet are 0.42 and 1.33.

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Yes, this is the algorithm and its implementation in Python for finding the largest difference between two consecutive integers in a list

Algorithm to find the largest difference between two consecutive integers in a list:

a.) We calculate the difference between the current element and the next element in the list by subtracting the current element from the next element.

b). We check if this difference is greater than the current max_diff. If it is, we update max_diff to this difference.

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If a plane is 111 mi north and 189 mi east of an airport, the pilot should turn 31.4 degrees to fly directly to the airport.

To find the angle that the pilot should turn in order to fly directly to the airport, we can use the trigonometric functions sine, cosine, and tangent. Specifically, we will use the tangent function, which relates the opposite side (in this case, the distance north) to the adjacent side (in this case, the distance east) of a right triangle:

tan(x) = opposite/adjacent

We can rearrange this formula to solve for x:

x = arctan(opposite/adjacent)

where arctan is the inverse tangent function.

In this case, the opposite side is 111 miles (the distance north) and the adjacent side is 189 miles (the distance east). Plugging these values into the formula, we get:

x = arctan(111/189)

x = 31.4 degrees

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The true population mean number of visitors per day ranges from 98.71 to 157.29, which we can affirm with 95% certainty.

To construct a confidence interval for the population mean number of visitors per day, we can use the following formula:

Confidence Interval = sample mean ± (critical value) x (standard error)

whereas the sample standard deviation is divided by the square root of the sample size to determine the standard error, the critical value is determined by the degree of confidence and the degrees of freedom.

We must first locate the critical value. A t-distribution is required because of the small sample size (n = 8). The critical value is 2.365 with 95% confidence and 7 degrees of freedom (8 - 1 = 7).

Next, we can calculate the standard error:

standard error = 38 / [tex]\sqrt{8}[/tex] = 13.427

Finally, we can construct the confidence interval:

Confidence Interval = 128 ± (2.365) x (13.427) = (98.71, 157.29)

Therefore, we can say with 95% confidence that the true population mean number of visitors per day is between 98.71 and 157.29.

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The upper and lower quartiles of the discounts are £45 and £20 respectively.

The interquartile range of the discounts is £25.

The upper and lower quartiles of the discounts can be calculated by using the following mathematical expressions;

Upper quartile, P₇₅ = 80 × 75/100

Upper quartile, P₇₅ = 60, which corresponds to £45.

Lower quartile, P₂₅ = 80 × 25/100

Lower quartile, P₂₅ = 20, which corresponds to £20.

Mathematically, the interquartile range (IQR) of a data set is typically calculated as the difference between the first quartile (Q₁) and third quartile (Q₃):

Interquartile range (IQR) = Q₃ - Q₁ = P₇₅ - P₂₅

Interquartile range (IQR) = 45 - 20

Interquartile range (IQR) = £25.

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By integrating function using substitution method the value of the integral is [tex]a^3/2[/tex].

What is a function ?

In computer science and mathematics, a function is a computational rule that takes one or more inputs (arguments) and produces a corresponding output. The output is determined solely by the input and the rule defining the function.

To perform this integration, we need to use a change of variables to express the integral in terms of the parameter t. We can use the following relationship between x, y, and z and the parameter t:

x = a cos t

y = 0

z = a sin t

We can use the chain rule to calculate the differential element dx, dy, dz in terms of dt:

dx = -a sin t dt

dy = 0

dz = a cos t dt

Using these expressions, we can express the integrand f(x,y,z) in terms of t:

f(x,y,z) = [tex]\sqrt{(x^2 z^2)[/tex] = [tex]\sqrt{((a cos t)^2 (a sin t)^2)[/tex] = [tex]a^2 |cos t sin t|[/tex]

The integral over the circle can then be expressed as:

[tex]\int \int (S) f(x,y,z) dS = \int ^{2\pi} \int ^{R} a^2 |cos t sin t| |(-a sin t)i + (0)j + (a cos t)k| dt\\= \int ^{2\pi} a^3 sin t cos t dt[/tex]

This integral can be evaluated using the substitution u = sin t, du = cos t dt:

[tex]\int ^{2π} a^3 sin t cos t dt =\int ^1 a^3 u du = a^3/2[/tex]

Therefore, the value of the integral is [tex]a^3/2[/tex].

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Answer:

Step-by-step explanation:

a) To determine if the polynomials 1+2t, 3+6t^2, 1+3t+4t^2 are linearly dependent in P2, we need to check if there exist constants c1, c2, and c3 such that c1(1+2t) + c2(3+6t^2) + c3(1+3t+4t^2) = 0, where 0 is the zero polynomial in P2.

Rewriting this equation in terms of the standard basis B = {1, t, t^2}, we have:

(c1 + c3) + (2c1 + 3c3)t + (4c2 + 3c3)t^2 = 0

This gives us the system of equations:

c1 + c3 = 0

2c1 + 3c3 = 0

4c2 + 3c3 = 0

Solving this system of equations, we get c1 = -3c3/2, c2 = -3c3/4. Therefore, any choice of c3 that is not equal to zero would give us a nontrivial solution, which implies that the polynomials are linearly dependent in P2.

b) To determine if the polynomials 1+2t+t^2, 3-9t^2, 1+4t+5t^2 are linearly dependent in P2, we need to check if there exist constants c1, c2, and c3 such that c1(1+2t+t^2) + c2(3-9t^2) + c3(1+4t+5t^2) = 0, where 0 is the zero polynomial in P2.

Rewriting this equation in terms of the standard basis B = {1, t, t^2}, we have:

(c1 + c3) + (2c1 + 4c3)t + (c1 + 5c3)t^2 - 9c2t^2 = 0

This gives us the system of equations:

c1 + c3 = 0

2c1 + 4c3 = 0

c1 + 5c3 - 9c2 = 0

Solving this system of equations, we get c1 = -2c3, c2 = (1/9)(c1 + 5c3). Therefore, any choice of c3 that is not equal to zero would give us a nontrivial solution, which implies that the polynomials are linearly dependent in P2.

The closure of b, denoted by b+, is the set of all elements that can be reached from b through one or more transitions in the set F. Starting with b, we see that the transition b+c is in F, which means we can add c to our set. Then, the transition c→{de} is also in F, so we can add d and e to our set. Therefore, the closure of b is b+ = {b, c, d, e}.

Given the set F = {a+b, b+c, c→de}, the closure of b refers to the smallest set that contains b and is closed under the operations in F. In this case, the closure of b would be {b, a+b, b+c}. This is because the set includes b and is closed under the addition operation with a and c, as specified in F.

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The car travels 220.5 feet before stopping.

To find the distance the car travels before stopping, we first need to determine the constant negative acceleration. We can use the formula vf = vi + at, where vf is the final velocity (0 ft/sec), vi is the initial velocity (63 ft/sec), a is the acceleration, and t is the time (7 seconds).

0 = 63 + 7a
-63 = 7a
a = -9 ft/sec²

Now, we can use the formula d = vi*t + 0.5*a*t² to find the distance (d).

d = (63 ft/sec)(7 sec) + 0.5*(-9 ft/sec²)(7 sec)²
d = 441 + (-220.5)
d = 220.5 ft

To graph the velocity from t=0 to t=7, plot a straight line with an initial velocity of 63 ft/sec and a constant negative slope of -9 ft/sec². The line will reach 0 ft/sec at t=7 seconds.

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The error message "x and y must have same first dimension but have shaped" typically occurs in programming languages such as Python or MATLAB when trying to operate on arrays or matrices with incompatible dimensions. In this case, the first dimension of the arrays or matrices must be the same, but they are not.

For example, if we have two arrays, x with shape (3, 4) and y with shape (2, 4), we cannot perform certain operations such as addition or multiplication between them because the first dimension, which represents the number of rows, is different.

To resolve this error, we can either reshape one of the arrays to have the same number of rows as the other, or we can transpose one of the arrays so that their dimensions match up. Another option is to adjust the code to ensure that the arrays being used have the same first dimension.

In summary, the "x and y must have the same first dimension but have shaped" error occurs when we attempt to operate on arrays or matrices with incompatible dimensions, and it can be resolved by reshaping, transposing, or adjusting the code.

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The total cost of 4 units is b)240.

Cost refers to the amount of money, time, or resources that are required to produce or acquire something. It is a fundamental concept in business and economics and is used to evaluate the efficiency and profitability of a particular activity or venture. Cost can be divided into two main categories: direct costs and indirect costs.

From the given options, we can see that each unit costs the same amount. So, to find the total cost of 4 units, we simply need to multiply the cost of one unit by 4.

Using the given options, we can see that option b (240) is the result of multiplying the cost of one unit by 4. Therefore, the total cost of 4 units is b)240.

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Answer:

The expression 3(x-10) can be simplified by distributing the 3 to both x and -10. This gives us:

3(x-10) = 3x - 30

So, the expression equivalent to 3(x-10) is 3x - 30.

Step-by-step explanation:

The two variables that have the highest correlation coefficient are Lot and House, with a correlation coefficient of 0.83. Therefore, the correlation between Lot and House is the most concerning when it comes to multicollinearity.

Multicollinearity is a common problem in regression analysis, which occurs when the independent variables in a regression model are highly correlated with each other. This means that the explanatory power of each independent variable is shared with other independent variables in the model, which can lead to biased and unstable estimates of the regression coefficients. In other words, multicollinearity makes it difficult to determine the individual effect of each independent variable on the dependent variable.

In this case, the correlation matrix shows that there are high correlations between several independent variables. However, the correlation coefficient between Lot and House is the highest, which suggests that these two variables are highly correlated with each other. Therefore, if both Lot and House are included in the regression model, it may be difficult to determine the individual effect of each variable on the Selling Price of a Home (Price). This can result in biased and unreliable estimates of the regression coefficients. Hence, it is important to check for multicollinearity before running the regression model and consider removing one of the highly correlated variables from the model.

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The expression for h is h = 2 × √(99)

The Pythagorean theorem states that in a right triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the other two sides.

An expression is a combination of numbers, variables, and operations that can be evaluated to produce a value. Expressions can be as simple as a single variable, such as x, or complex, involving multiple variables, constants, and functions.

According to the given information:

We can use the Pythagorean theorem to relate the slant height, the radius, and the height of a cone:

s² = r² + h²

Since s = 5r and r = 4, we have:

s = 5r = 5(4) = 20

Plugging this into the equation above, we get:

20² = 4² + h²

Simplifying and solving for h, we have:

h² = 20² - 4² = 396

h = √(396) = √(4 × 99) = 2 ×√(99)

Therefore, the expression for h is h = 2 × √(99) when r = 4 and s = 5r.

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The measures of the angles in the triangle are: A = 36.87 degree, B = 71.37 degrees
C = 72.76 degrees

Using the law of cosines, we can solve for angle A:

a^2 = b^2 + c^2 - 2bc*cos(A)
6^2 = b^2 + 10^2 - 2*6*10*cos(A)
36 = b^2 + 100 - 120*cos(A)
b^2 = 84 - 100 + 120*cos(A)
b^2 = -16 + 120*cos(A)

Now, using the law of sines, we can solve for angle B:

sin(B)/b = sin(A)/a
sin(B)/b = sin(A)/6
sin(B) = (b/6)*sin(A)
sin(B) = (1/6)*sqrt(-16 + 120*cos(A))*sin(A)

We can substitute this expression for sin(B) into the equation for the law of cosines to solve for angle B:

c^2 = a^2 + b^2 - 2ab*cos(B)
10^2 = 6^2 + b^2 - 2*6*b*sin(B)
100 = 36 + b^2 - 2*6*b*((1/6)*sqrt(-16 + 120*cos(A))*sin(A))
64 = b^2 - b*sqrt(-16 + 120*cos(A))*sin(A) - 32*cos(A)

This is a quadratic equation in b. Solving for b using the quadratic formula, we get:

b = (1/2)*sqrt((-16 + 120*cos(A))*sin(A)^2 + 128*cos(A) + 64)

Substituting this expression for b back into the equation for sin(B), we get:

sin(B) = (1/6)*sqrt(-16 + 120*cos(A))*sin(A)
sin(B) = (1/6)*sqrt((-16 + 120*cos(A))*sin(A)^2 + 128*cos(A) + 64)

Now we can use the inverse sine function to solve for angles A and B:

A = sin^-1(6/10) = 36.87 degrees
B = sin^-1((1/6)*sqrt((-16 + 120*cos(A))*sin(A)^2 + 128*cos(A) + 64)) = 71.37 degrees

Finally, we can solve for angle C:

C = 180 - A - B = 72.76 degrees

Therefore, the measures of the angles in the triangle are:

A = 36.87 degrees
B = 71.37 degrees
C = 72.76 degrees

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In simple harmonic motion, the number of cycles per second of a point is its frequency. Here's a step-by-step explanation:

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The critical numbers of the function f(x) are -3, 0, and 2.

The critical numbers of a function are the values of x at which either the function has a maximum, minimum, or a point of inflection. To find the critical numbers of the given function f(x) = 3x⁴ + 4x³ − 36x², we need to find the derivative of the function and set it equal to zero.

f'(x) = 12x³ + 12x² - 72x
Setting this derivative equal to zero and solving for x, we get:
x = -3, 0, 2

To find the critical numbers of a function, we first need to find its derivative. The derivative gives us information about the slope of the function at each point, and where the function is increasing or decreasing. When the derivative is zero, it means that the slope is flat, which could indicate a maximum, minimum, or point of inflection.

In this case, we found the derivative of the function f(x) and set it equal to zero to solve for the critical numbers. We got three values of x, which are the critical numbers of the function. These values are -3, 0, and 2. At these values, the function either has a maximum, minimum, or a point of inflection.

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