the function f(x)=1/ln(3x) is guaranteed to have an absolute maximum and minimum on the interval [14,2]

The gardener will need to purchase an additional 6 1/2 ft of fencing to complete his square garden for his flowers.

You want to know how much more fencing the gardener will need to purchase if he already has 4 1/2 ft of fencing and

the length of one side of the square garden is 2 3/4 ft.

Since the garden is square, all sides have the same length. We know one side is 2 3/4 ft.

Multiply the length of one side (2 3/4 ft) by 4 to find the total amount of fencing needed for the entire garden:

2 3/4 × 4 = 11 ft.

Now, subtract the amount of fencing the gardener already has (4 1/2 ft) from the total amount needed (11 ft):

11 - 4 1/2 = 6 1/2 ft.

So, the gardener will need to purchase an additional 6 1/2 ft of fencing to complete his square garden for his flowers.

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The required volume of the solid region f is :

64/3 cubic units.

To find the volume of the solid region f bounded by the two parabolic cylinders z = 16 − y2 and z = 16 − x2 in the first octant, we need to set up a triple integral over the region f.

We can integrate over the x, y, and z coordinates, with the limits of integration as follows:

0 ≤ x ≤ 4
0 ≤ y ≤ 4
16 − y2 ≤ z ≤ 16 − x2

The limits for x and y are simply the boundaries of the first octant. The limits for z are given by the two equations of the parabolic cylinders, with the lower limit being the curve z = 16 − y2 and the upper limit being the curve z = 16 − x2.

Therefore, the volume of the solid region f is given by:

∫∫∫ f dV = ∫∫∫ 1 dV

Where f = 1, since we are integrating over a solid region with a constant density of 1.

Using the limits of integration above, we can evaluate the triple integral as follows:

∫0^4 ∫0^4 ∫16−y^2^16−x^2 1 dz dy dx

= ∫0^4 ∫0^4 [16 − y2 − (16 − x2)] dy dx

= ∫0^4 ∫0^4 (x2 − y2) dy dx

= ∫0^4 [(x2y − y3/3)]0^4 dx

= ∫0^4 (4x2) dx

= [4x3/3]0^4

= 64/3 cubic units.

Therefore, the volume of the solid region f is 64/3 cubic units.

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The value of det(2A) = 8 from the given data, and value of det(A).

Suppose a is a 3x3 matrix and det(a) = 1. To find det(2a), we can use the property that det(kA) = k^n * det(A), where k is a constant and A is an n x n matrix. In this case, k = 2 and n = 3. Therefore, det(2a) = 2^3 * det(a) = 8 * 1 = 8. So, det(2a) is equal to 8.

Hi! I'm happy to help you with your question. Suppose matrix A is a 3x3 matrix and det(A) = 1. We want to find the determinant of matrix 2A.

Step 1: Multiply the matrix A by 2. This means that each element of matrix A is multiplied by 2, resulting in the matrix 2A.

Step 2: Compute the determinant of the new matrix, det(2A). Since A is a 3x3 matrix, when you multiply it by a scalar (in this case, 2), the determinant will be affected by the scalar raised to the power of the matrix size (3). So, det(2A) = 2^3 * det(A).

Step 3: Substitute the given value of det(A) = 1 into the equation. So, det(2A) = 2^3 * 1.

Step 4: Calculate the result: det(2A) = 8 * 1 = 8.

Therefore, det(2A) = 8.

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The successive crests and troughs on the periodic function graph indicates that the period is 6.0 seconds, therefore;

A periodic function is a function that repeats the same values of the output variable at regular intervals.

The coordinates of the points on the periodic function graph are; (2.5, 2900), (5.5, 1100), (8.5, 2900), and (11.5, 1100)

The period is the time it takes to complete a cycle of the periodic function, which is the time between successive crests or troughs.

The crests and troughs in the graph are;

Crest; (2.5, 2900), (8.5, 2900)

Trough; (5.5, 1100), (11.5, 1100)

The period, which is the time between successive crests and troughs are therefore;

Period, T = 8.5 - 2.5 = 11.5 - 5.5 = 6.0

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8ln(4) is the area encompassed by the curves y = 2/x, y = 8x, and the x-axis.

To determine the area bounded by the given curves, we must first determine the points of intersection. Because y > 0, we only consider the section of the curve between these two points when we solve y = 2/x and y = 8x.

On integrating y = 2/x with respect to x, we will get the area under the curve. We will use limit x = 1/4 to x = 2. For the area above the x axis, the limits will be x = 1/4 to x = 2 for integration of y = 8x with respect to x.

As a result, the area contained by the curves is equal to the difference between these two areas, which is 8ln(4).

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Answer: 10/663 or 1.51% chance

Step-by-step explanation: drawing a 4 is a 1/52 chance, and then drawing a non face card is 40/51 chance. you have to multiply those together to get 40/2652 or 10/663 chance. 10/663 is a 1.51% chance

Answer:

  cos(A+B) = 207/305

Step-by-step explanation:

You want the simplest form of cos(A+B), where tan(A) = 11/60 and sin(B) = 3/5.

The identity for the cosine of the sum of angles is ...

  cos(A+B) = cos(A)cos(B) -sin(A)sin(B)

In order to use this formula, we would need to find the sine and cosine of A, and the cosine of B.

The two numbers in the ratio for tan(A) represent legs of a right triangle. The hypotenuse of that triangle is ...

  c² = a² +b²

  c² = 11² +60² = 121 +3600 = 3721

  c = √3721 = 61

Then the trig values of interest are ...

The cosine of angle B is ...

  cos(B) = √(1 -sin²(B)) = √(1 -(3/5)²) = √(16/25) = 4/5

Then our cosine is ...

  cos(A+B) = (60/61)(4/5) -(11/61)(3/5) = (60·4 -11·3)/(61·5)

  cos(A+B) = 207/305

Step-by-step explanation:

To find the coterminal angle with -442° we can add or subtract any integer multiple of 360°.

-442° + 360° = -82°

So one coterminal angle with -442° is -82°.

To determine the quadrant, we need to consider the sign of the angles in each quadrant. Since -442° is negative, it lies in the clockwise direction, which means it falls in the fourth quadrant.

To find the reference angle, we need to find the acute angle between the terminal side of the angle and the x-axis. We can do that by subtracting the nearest multiple of 360°.

-442° + 360° = -82° (the smallest positive coterminal angle)

Reference angle = 82°

Therefore, the coterminal angle with -442° between 0° and 360° is 318°, it lies in the fourth quadrant and the reference angle is 82°.

Based on this, we can conclude that an increase in price will result in a decrease in total revenue, since the increase in price will be offset by a larger decrease in quantity demanded

To find the elasticity of demand, we need to calculate the derivative of q with respect to p multiplied by the ratio of p to q.

Taking the derivative of the demand function with respect to p, we get:

q + 100 = -p/q

Multiplying both sides by p/q, we get:

p/q * q + 100p/q = -p

Simplifying, we get:

p/q = -100/(q^2 - p)

When p = $200, we can substitute this value into the equation to get:

200/q = -100/(q^2 - 200)

Solving for q, we get:

q = 50

So at a price of $200, the quantity demanded is 50 units. To find the elasticity, we need to calculate:

E = (dq/dp) * (p/q)

Taking the derivative of the demand function with respect to p, we get:

dq/dp = -1/q^2

Substituting p = $200 and q = 50, we get:

dq/dp = -1/2500

Substituting into the formula for elasticity, we get:

E = (-1/2500) [tex]\times[/tex] (200/50) = -0.16

Since the elasticity is negative, we know that demand is inversely related to price, meaning that as the price increases, the quantity demanded will decrease.

Since the elasticity is greater than 1 in absolute value, we know that demand is elastic, meaning that a change in price will result in a relatively larger change in quantity demanded.

Based on this, we can conclude that an increase in price will result in a decrease in total revenue, since the increase in price will be offset by a larger decrease in quantity demanded.

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Answer:

64

Step-by-step explanation:

Number of outcomes = number of choices per question ^ number of questions

In this case, the number of choices per question is 4 and the number of questions is 3. Plugging these values into the formula, we get:

Number of outcomes = 4^3 = 64

The surface area of the image is C. 5/16 yd^2.

The surface area of a given shape is the summation of the area of all its external surfaces. The shape and number of surfaces determines the surface area of a shape.

In the given image, the surface area can be determined by;

Area of triangle = 1/2*base*height

                          = 1/2*1/4*1/2

                          = 1/16

Area of each triangular surface is 1/16 sq. yd.

Area of its square base = length*length

                                = 1/4*1/4

                                = 1/16

Area of its square base is 1/16 sq. yd.

So that;

The surface area of the image = 1/16 + (4*1/16)

                                      = 1/16 + 1/4

                                      = (1 + 4) 16

                                      = 5/16

The surface area is C. 5/16 yd^2'

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The triple integral for the given solid between the surfaces z=0, x= 1, z= 1-x^2, and z= 1 -y^2 is π/24.

To set up the triple integral for the solid between the given surfaces, we need to find the limits of integration for each variable.

Since the solid lies between the planes z=0 and z=1-x^2 and z=1-y^2, the limits for z are 0 to 1-x^2 and 0 to 1-y^2.

The solid is also bounded by the planes x=1 and y=1, so the limits for x and y are 0 to 1 and 0 to 1, respectively.

Therefore, the triple integral for the given solid is:

∫∫∫ dV = [tex]\int\limits^1_0[/tex] [tex]\int\limits^1_0[/tex]-y^2 [tex]\int\limits^1_0[/tex]-x^2 dzdydx

Simplifying the limits of integration, we get:

∫∫∫ dV = [tex]\int\limits^1_0[/tex] ∫ from 0 to √(1-x) ∫ from 0 to 1-x^2 dzdydx

Evaluating the integral, we get:

∫∫∫ dV = [tex]\int\limits^1_0[/tex] ∫ from 0 to √(1-x) (1-x^2) dydx

= [tex]\int\limits^1_0[/tex] [(1/3)(1-x^2)^(3/2)]dx

= (1/3) [tex]\int\limits^1_0[/tex] (1-x^2)^(3/2) dx

Making the substitution u = 1-x^2, we get:

∫∫∫ dV = (1/6) [tex]\int\limits^1_0[/tex] u^(1/2) (1-u)^(1/2) du

= (1/6) B(3/2, 3/2)

= (1/6) (Γ(3/2)Γ(3/2))/Γ(3)

= (1/6) [(√π/2)(√π/2)]/2

= π/24

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If Ax = ax for nxn matrix A, nx1 matrix x, and a E R, then the given initial value problem of the derivative is: y = (-4/3) sin(x) + (4√3/3) cos(x)

The given differential equation is:

d²y/dx² + y = 0

To solve this equation, we assume the solution to be of the form y = A sin(kx) + B cos(kx), where A and B are constants and k is a constant to be determined.

Taking the derivatives of y with respect to x, we get:

dy/dx = Ak cos(kx) - Bk sin(kx)

d²y/dx² = -Ak² sin(kx) - Bk² cos(kx)

Substituting the values in the differential equation, we get:

(-Ak² sin(kx) - Bk² cos(kx)) + (A sin(kx) + B cos(kx)) = 0

Simplifying, we get:

(Ak² + 1) sin(kx) + (Bk² + 1) cos(kx) = 0

Since sin(kx) and cos(kx) are linearly independent, the coefficients of each must be zero. Therefore, we have the following two equations:

Ak² + 1 = 0 ...(1)

Bk² + 1 = 0 ...(2)

Solving the equations for k, we get:

k = ±i

Thus, the general solution of the differential equation is:

y = A sin(x) + B cos(x)

To solve for the constants A and B, we use the given initial conditions:

y(π/3) = 0 and y'(π/3) = 2

Substituting the values in the above equation, we get:

A sin(π/3) + B cos(π/3) = 0

and

A cos(π/3) - B sin(π/3) = 2

Solving the equations for A and B, we get:

A = -4/3 and B = 4√3/3

Therefore, the solution of the given initial value problem is:

y = (-4/3) sin(x) + (4√3/3) cos(x)

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To rewrite the given parametric equations as Cartesian equations, we need to eliminate the parameter t. For the first equation, we get the Cartesian equation y = (3/2)x - (5/4). For the second equation, we get the Cartesian equation y = ln(x^2).

For the first equation x(t) = 3t - 2, y(t) = 5t^2, we need to eliminate t to get the Cartesian equation. Solving for t in terms of x, we get t = (x + 2)/3. Substituting this value in the equation for y, we get y = 5((x+2)/3)^2. Simplifying this, we get y = (3/2)x - (5/4).

For the second equation x(t) = e^(2t), y(t) = e^(4t), we need to eliminate t to get the Cartesian equation. Taking the natural logarithm of both sides of the equation for y, we get ln(y) = 4t.

Solving for t, we get t = ln(y)/4. Substituting this value in the equation for x, we get x = e^(2(ln(y)/4)), which simplifies to x = y^(1/2). Therefore, the Cartesian equation for this parametric equation is y = ln(x^2).

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cut shape into two which is triangle and a trapezium use to formulas of the identified shapes in solving the area

Answer:-42

Step-by-step explanation:

The individual linearizations of f(x) and f'(x) at x0 are combined to obtain the linearization of f(x) at x0.

To find the linearization of a function f(x) at a point x0, we use the following formula:

L(x) = f(x0) + f'(x0)(x - x0)

where f'(x0) represents the derivative of f(x) evaluated at x0.

The linearization of f(x) at x0 is an approximation of the function near x0, where the approximation is a linear function. It is related to the individual linearizations of f(x) and f'(x) at x0 in the following way:

The linearization of f(x) at x0 is a linear function that approximates f(x) near x0. It can be seen as the "best" linear approximation of f(x) near x0.

The linearization of f'(x) at x0 is a constant value that represents the slope of the tangent line to f(x) at x0. This constant value is also known as the instantaneous rate of change of f(x) at x0.

The linearization of f(x) at x0 can be obtained by combining the constant value f(x0) and the linear function f'(x0)(x - x0). The linear function represents the change in f(x) as x moves away from x0, while the constant value f(x0) represents the value of f(x) at x0.

Therefore, the individual linearizations of f(x) and f'(x) at x0 are combined to obtain the linearization of f(x) at x0.

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Answer:

= 500 x 3^t

Step-by-step explanation:

Exponential equation!

Answer:

10

Step-by-step explanation:

The median is the number in the middle when they are in order

-6, -4, 4, 5, 7, 10, 11, 12, 13, 16, 20

Answer:

A) the middle number in a numerical data set when the values have been arranged in numerical order.

With the help of percentage, 87.5% of the bean seeds should sprout.87.5% of the bean seeds should sprout.

Percentage is a way of expressing a number as a fraction of 100. It is often used to represent a portion or a rate of change.

The given information states that 21 out of 24 bean seeds sprouted in the first period. This means that 87.5% (or 21/24) of the seeds sprouted in that period. Therefore, statement A is supported by the information given.

Statement B suggests that more than 100 bean seeds should sprout, but this is not necessarily true based on the information provided. The total number of seeds planted is not given, so we cannot determine whether more than 100 seeds should sprout. Therefore, statement B is not supported by the information given.

Statement C suggests that 1 out of 8 bean seeds will not sprout. However, this statement is not necessarily true based on the information given. It is possible that more or fewer than 1 out of 8 bean seeds did not sprout. Therefore, statement C is not supported by the information given.

Statement D suggests that at least 20 bean seeds will not sprout. This statement is not necessarily true based on the information given. It is possible that fewer than 20 bean seeds did not sprout. Therefore, statement D is not supported by the information given.

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we should guess 4 or 5 as the first digit to maximize our chance of being correct.

The graph below shows the approximate probabilities for n = 1 to 10.

we find that this occurs when n is approximately 65.

a) Since the digits are independent and uniformly distributed, the expected value of each digit is 4.5.

Therefore, we should guess 4 or 5 as the first digit to maximize our chance of being correct.

b) For n = 1, there is a 10% chance of guessing correctly. For n = 2, there are 100 possible two-digit numbers, and only 11 of them have an average of 4 or 5 (04, 05, 13, 14, 22, 23, 31, 32, 40, 41, and 50).

Therefore, the chance of guessing correctly is 11/100 or 11%. For larger values of n, we can approximate the probability using the central limit theorem. The distribution of Dn approaches a normal distribution with mean 4.5 and standard deviation sqrt(8.25/n). Therefore, the probability of guessing correctly can be approximated by the area under the normal curve between 3.5 and 5.5. The graph below shows the approximate probabilities for n = 1 to 10.

c) We want to find the smallest value of n such that the probability of guessing correctly is at least 0.99. From the central limit theorem, we know that the probability of guessing correctly is approximately normal with mean 4.5 and standard deviation sqrt(8.25/n).

Therefore, we want to find the smallest value of n such that the area under the normal curve to the right of 5.5 is at least 0.01. Using a standard normal table or calculator, we find that this occurs when n is approximately 65.

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If g(x)=t(x)/e^3x, then the simplified form of g'(x) = (t'(x) - 3t(x)) / e^3x

The quotient rule is a formula used to find the derivative of a function that is expressed as a quotient of two functions. The quotient rule is a useful tool in calculus for finding the derivative of a wide range of functions.

To find the derivative of g(x), we can use the quotient rule

g'(x) = [(e^3x)(t'(x)) - (t(x))(3e^3x)] / (e^3x)^2

where t'(x) represents the derivative of t(x) with respect to x.

We can simplify this expression by factoring out e^3x from the numerator

g'(x) = [e^3x(t'(x) - 3t(x))] / e^6x

Now we can cancel out the e^3x terms

g'(x) = (t'(x) - 3t(x)) / e^3x

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Answer:

C. 7.5x - 21

Step-by-step explanation:

We can distribute the 3 to both the 2.5x and the -7

(3 * 2.5x) + (3 * -7)

7.5x - 21

The Laplace transform of the following functions are: a. (112s + 16)/s; b. (5s^2 + 20s + 10e^-2s - 20)/s(s+2)^2; c. (10s - 40)/(s^2 + 400)(s+4); d. 1.5/s^2 - 1.5e^(-10s)/s^2 + 150/s; e. 1.5/s^2 - 1.5e^(-10s)/s^2 + 15/s - 15e^(-10s)/s; f. 1.5/s^2 - 1.5e^(-10s)/s^2 + 30/(s+15); g. e^(-3s) * (-1/s^2 + 2/s); h. 6/(s+2) * (1/(s+11)).

The Laplace transform of the following functions are:

a. L{a(t)} = 28L{δ(t)} + 3L{1} + 4L{u(t)}

= 28 + 3s + 4(1/s)

= (112s + 12 + 4)/s

= (112s + 16)/s

b. L{b(t)} = 5L{1} - 5L{e-2t(1 + 2t)}

= 5/s - 5L{e-2t}L{1 + 2t}

= 5/s - 5/(s + 2)^2 * (1 + 2/s)

= (5s^2 + 20s + 10e^-2s - 20)/s(s+2)^2

c. L{c(t)} = 10L{e-4t}L{cos(20t+36.99)}

= 10/(s+4) * [s/(s^2 + 400) - 4/(s^2 + 400)]

= (10s - 40)/(s^2 + 400)(s+4)

d. L{d(t)} = 1.5L{tu(t)} - 1.5L{(t-100)u(t-10)}

= 1.5(1/s^2) - 1.5e^(-10s)(1/s^2 - 100/s)

= 1.5/s^2 - 1.5e^(-10s)/s^2 + 150/s

e. L{f(t)} = 1.5L{tu(t)} - 1.5L{(t-10)u(t-10)} - 15L{u(t-10)}

= 1.5(1/s^2) - 1.5e^(-10s)(1/s^2 - 10/s) - 15e^(-10s)/s

= 1.5/s^2 - 1.5e^(-10s)/s^2 + 15/s - 15e^(-10s)/s

f. L{g(t)} = 1.5L{tu(t)} - 1.5L{(t-10)u(t-10)} - 3L{(t-15)u(t-15)}

= 1.5(1/s^2) - 1.5e^(-10s)(1/s^2 - 10/s) - 3e^(-15s)(1/s)

= 1.5/s^2 - 1.5e^(-10s)/s^2 + 30/(s+15)

g. L{h(t)} = L{(t+2)u(t-3)}

= e^(-3s) * L{(t+2)}

=  e^(-3s) * (-1/s^2 + 2/s)

h. L{j(t)} = 6L{e^(-2t)}L{e^(11u(t-5))}

= 6/(s+2) * L{e^(11u(t-5))}

= 6/(s+2) * L{e^(11u(t-5))}

= 6/(s+2) * (1/(s+11))

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The 70th percentile of current measurement is 11.05 milliamperes.

To find the 70th percentile of the current measurement, we need to find the value of the current measurement that separates the lowest 70% of measurements from the highest 30% of measurements.

We can use a standard normal distribution table or a calculator to find the z-score that corresponds to the 70th percentile, which is 0.5244.

Then we can use the formula:

x = μ + zσ

where x is the value of the current measurement, μ is the mean of the distribution, σ is the standard deviation, and z is the z-score corresponding to the 70th percentile.

Plugging in the values, we get:

x = 10 + 0.5244(2) = 11.05

Therefore, the 70th percentile of current measurement is 11.05 milliamperes.

So, the answer is 11.05.

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The correct answer is option D: that the values of the data must fall within the 1% critical range of the curve in order to be significant.

An alpha level of α = .01 sets the threshold for statistical significance at the 1% level, meaning that the values of the data must fall within the critical range of the curve (which represents the distribution of the data) that includes the central 99% of the values in order to be deemed statistically significant.

An alpha level of α = .01 is a statistical significance level that is commonly used in research. It represents the probability of obtaining a result as extreme or more extreme than the observed result, assuming the null hypothesis is true. A significance level of α = .01 means that the researcher has set the critical value at 0.01 or 1%.

Therefore, for a statistical test to be considered significant, the p-value must be less than 0.01. In other words, the values of the data must fall within the 1% critical range of the curve in order to be significant.

It is important to set a significance level before conducting a statistical test as it helps to determine the level of confidence in the results obtained from the test.

The correct answer is option D: that the values of the data must fall within the 1% critical range of the curve in order to be significant

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The lengths of the given line segments using Pythagoras theorem are:

ON = 15.75

M O = 21.75

We know from circle geometry that the tangent to a circle is usually perpendicular to the radius of that circle at the point of tangency.

perpendicular to ON.

Now, we are given that:

MN = 15

MP = 6

We also see that ON = OP by radius definition. Thus:

Using Pythagoras theorem we have:

(6 + ON)² = 15² + ON²

36 + 12ON + ON² = 225 + ON²

36 + 12ON = 225

12ON =  225 - 36

ON = 189/12

ON = 15.75

Thus:

M O = 6 + 15.75

M O = 21.75

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The exact angles in radians and in the interval π/6 [0, π] are:

[tex]cos^{-1}[/tex](-√(3)/2) = 7π/6

[tex]cos^{-1}[/tex](0) = π/2

[tex]cos^{-1}[/tex](√(2)/2) = π/4

The cosine inverse function, also known as the arccosine function, is the inverse function of the cosine function. It takes a value between -1 and 1 and returns the corresponding angle between 0 and π (or 0 and 180 degrees) whose cosine is that value. The notation for the cosine inverse function is cos⁻¹ or arccos.

For example, cos⁻¹(1/2) = π/3, since the cosine of π/3 is 1/2.

[tex]cos^{-1}[/tex](-√(3)/2) is in the second quadrant where cosine is negative. Using the unit circle, we can see that this angle is π/6 + pi = 7π/6.

[tex]cos^{-1}[/tex](0) is in the first and second quadrants where cosine is 0. This means the possible angles are π/2 and 3π/2. However, since we are only considering angles in the interval pi/6 [0, pi], the answer is π/2.

[tex]cos^{-1}[/tex](√(2)/2) is in the first quadrant where cosine is positive. Using the unit circle, we can see that this angle is π/4.

Therefore, the exact angles in radians and in the interval π/6 [0, pi] are:

[tex]cos^{-1}[/tex](-√(3)/2) = 7π/6

[tex]cos^{-1}[/tex](0) = π/2

[tex]cos^{-1}[/tex](√(2)/2) = π/4

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The exact angles in radians and in the interval π/6 [0, π] are:

[tex]cos^{-1}[/tex](-√(3)/2) = 7π/6

[tex]cos^{-1}[/tex](0) = π/2

[tex]cos^{-1}[/tex](√(2)/2) = π/4

The cosine inverse function, also known as the arccosine function, is the inverse function of the cosine function. It takes a value between -1 and 1 and returns the corresponding angle between 0 and π (or 0 and 180 degrees) whose cosine is that value. The notation for the cosine inverse function is cos⁻¹ or arccos.

For example, cos⁻¹(1/2) = π/3, since the cosine of π/3 is 1/2.

[tex]cos^{-1}[/tex](-√(3)/2) is in the second quadrant where cosine is negative. Using the unit circle, we can see that this angle is π/6 + pi = 7π/6.

[tex]cos^{-1}[/tex](0) is in the first and second quadrants where cosine is 0. This means the possible angles are π/2 and 3π/2. However, since we are only considering angles in the interval pi/6 [0, pi], the answer is π/2.

[tex]cos^{-1}[/tex](√(2)/2) is in the first quadrant where cosine is positive. Using the unit circle, we can see that this angle is π/4.

Therefore, the exact angles in radians and in the interval π/6 [0, pi] are:

[tex]cos^{-1}[/tex](-√(3)/2) = 7π/6

[tex]cos^{-1}[/tex](0) = π/2

[tex]cos^{-1}[/tex](√(2)/2) = π/4

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The calculated perimeter of the classroom is approximately 34 feet.

The area of the square classroom is given as 72 square feet.

Let's find the length of one side of the square by taking the square root of 72:

√(72) ≈ 8.5

So each side of the square is approximately 8.5 feet long.

The perimeter of the square is the sum of the lengths of all four sides:

Perimeter = 4 x Length of one side

Perimeter = 4 x 8.5 feet

Perimeter = 34 feet

Therefore, the perimeter of the classroom is approximately 34 feet.

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