Twin brothers wish to get a driver's license. They must pass a driving test to obtain the license Each time they take the test the probability of passing is identical. The result of each test is independent of the result of any other test. The test results for each brother are independent The average number of times the first brother must take the test to get a license is 5. The probability the second brother passes a test is 0.3 (a) What is the probability the first brother will need to take more than 4 tests to get a license? (b) What is the probability the second brother needs more than 2 test attempts but no more than 4 test attempts to obtain a license? (c) What is the probability the first brother passes on his first attempt and the second brother passes on his second attempt?

The following equation

∫166x x²dx = 9/2

∫16xdx = 18

∫67x²dx = 127/3.

To integration by substitution to solve the given integral.

Let u = x² then du/dx = 2x and dx = du/(2x).

Substituting for x and dx we get:

∫166x x²dx = ∫166x u du/(2x)

= (1/2)∫166x u¹ du

= (1/2) [(u²/2)|6]

= 1/4[u²|6]

= 1/4(6²)

= 9/2

∫166x x²dx = 9/2.

Now, using the given information we can evaluate the integral of 16x:

∫16xdx = x²/2|6

= 18.

And using the given information we can evaluate the integral of 67x²:

∫67x²dx = 127

∫166x x²dx = 9/2

∫16xdx = 18

∫67x²dx = 127/3.

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The double dot plot shows the quiz scores for two different class periods, represented by the two sets of data points. Each data point represents the score of a single student on the quiz.

The first population, represented by the data points on the left side of the plot, appears to have a center at around 16-18 points and a variation that is more spread out. This suggests that the students in this class period had a wider range of quiz scores, with some students scoring higher and some scoring lower.

The second population, represented by the data points on the right side of the plot, appears to have a center at around 8-10 points and a variation that is more tightly clustered. This suggests that the students in this class period had a narrower range of quiz scores, with fewer students scoring higher and fewer scoring lower.

 Based on these observations, an inference that can be drawn about the two populations is that the class period with higher quiz scores had more students who performed well on the quiz, while the class period with lower quiz scores had fewer students who performed well on the quiz. This suggests that the level of student proficiency in the subject may vary across class periods, and that it may be important to consider this variability when designing instructional strategies.

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Part A: Given that a food truck did a daily survey of customers to find their food preferences. A frequency table is provided with incomplete data.

To complete the table, we need to analyze the data and answer the questions. The completed table for the frequency of food preferences is shown below: Food preferences Frequency Burgers 10Tacos 7Hot dogs 5Sandwiches 8Total 30

Part B: The percentage of customers who prefer each food item can be calculated by dividing the frequency of each item by the total number of customers and then multiplying by 100.Percentages of customers who prefer each food item: Food preferences Frequency Percentage Burgers 10 33.33%Tacos 7 23.33%Hot dogs 5 16.67%Sandwiches 8 26.67%Total 30 100%

Part C: The mode of the food preferences is the item with the highest frequency. In this case, burgers are the most preferred food item by the customers, with a frequency of 10. Therefore, the mode of the food preferences is burgers.

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The amount a store would receive on a credit card sale after they pay the percentage to the credit card company is $42.21

Amount of purchase = $8.65 + $14.00 + $21.78 = $44.43

Rate charged by the credit card company = 5%

Amount charged by the credit card company = 5% of $44.43 = (5/100) × $44.43 = $2.22

Thus, the amount a store would receive on a credit card sale after paying the percentage to the credit card company is $44.43 - $2.22 = $42.21.

Therefore, the store would receive $42.21 on a credit card sale after paying the percentage to the credit card company.

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Answer:

5

Step-by-step explanation:

solve normally

subtract the denominator

10-6 gives 4

20/4

gives 5

Answer:

-14b + 3k

Step-by-step explanation:

First we can divide the equation up:

(-8(b-k)) - (3(2b+5k))

Let's do distribution with the first parentheses:

-8b + 8k

Let's do distribution with the second parentheses:

6b+5k

Now we have:

(-8b+8k) - (6b+5k)

= -14b + 3k

To find the critical F value with 6 numerator and 60 denominator degrees of freedom at alpha = 0.05, we need to use an F-distribution table or a calculator that can compute F-distribution probabilities.

The F-distribution table lists values for different combinations of degrees of freedom and alpha levels. For this problem, we are interested in the critical F value at alpha = 0.05, which means we need to find the value in the table that corresponds to an area of 0.05 in the right-tail of the F-distribution curve with 6 and 60 degrees of freedom.

Using a table or calculator, we find that the critical F value with 6 numerator and 60 denominator degrees of freedom at alpha = 0.05 is approximately 2.37. This means that if the calculated F-statistic from a sample falls above 2.37, we would reject the null hypothesis at the 0.05 significance level.

It's important to note that the exact critical F value may vary slightly depending on the specific F-distribution table or calculator used, as well as any rounding or approximation errors in the calculation.

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The number of adult tickets sold is 55 and the number of student tickets sold is 2.

Let the number of student tickets be x and the number of adult tickets be y.

Step 1: Constructing the equations

Given,Student tickets cost $5 and adult tickets cost $7.The dance team sold 57 tickets and made $395. In order to find the number of student and adult tickets sold, we need to construct two equations.Using the given information, we can write the following equations:

x + y = 57  (Equation 1)

5x + 7y = 395  (Equation 2)

Step 2: Solving the equations We need to solve the equations we have constructed to find the values of x and y. We can do this using the elimination method by multiplying the first equation by 5 and subtracting the second equation from it.

5x + 5y = 285  (Multiplying Equation 1 by 5)

5x + 7y = 395  (Equation 2)2y = 110  

(Subtracting Equation 2 from Equation 1)

y = 55  (Dividing by 2)

Now we can substitute y = 55 in Equation 1 to find x:

x + 55 = 57  (Substituting y = 55) x = 2

Therefore, the number of adult tickets sold is y = 55 and the number of student tickets sold is x = 2.

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Hank spends $1230 on rent and $410 on car payments.

Let x be the amount of money spent on rent by Hank, and y be the amount of money spent on car payments by Hank. The ratio of Hank's income spent on rent to his income spent on car payment is 3 to 1, that is, x:y = 3:1.In other words, 3y = x. We also know that Hank spends a total of $1640 on rent and car payment, so :x + y = $1640.

We can now solve the system of equations formed by these two equations:3y = xx + y = $1640.Substituting the first equation into the second equation to eliminate x, we get:3y + y = $16404y = $1640y = $410.So Hank spends $410 on car payments .To find how much he spends on rent, we can use the equation x = 3y: x = 3($410) = $1230.

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The service level is 6.6%, indicating the percentage of demand that can be met from current stock.

To calculate the service level, we need to use the service level formula, which is:

Service Level = (Demand During Lead Time + Safety Stock) / Average Demand

In this case, we are given the historical average demand, which is 6105 units with a standard deviation of 243. We are also given that the company currently has 6647 units in stock. We need to calculate the demand during the lead time and the safety stock.

Assuming the lead time is zero (i.e., we receive inventory instantly), the demand during the lead time is also zero. Therefore, the demand during lead time + safety stock = safety stock.

To calculate the safety stock, we can use the following formula:

Safety Stock = Z * Standard Deviation * Square Root of Lead Time

Where Z is the number of standard deviations from the mean that corresponds to the desired service level. For example, for a service level of 95%, Z is 1.645 (assuming a normal distribution).

Assuming a lead time of one day and a desired service level of 95%, we can calculate the safety stock as follows:

Safety Stock = 1.645 * 243 * sqrt(1) = 402.76

Substituting the values into the service level formula, we get:

Service Level = (0 + 402.76) / 6105 = 0.066 or 6.6%

Therefore, the service level is 6.6%.

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The total cost of the dinner for you and your friend, including the 20% tip, is $30.98.

The cost of the meal for your friend is given as $25. To calculate the total cost, including the tip, you need to determine 20% of $25, which is the tip amount. To find 20% of a value, you can multiply the value by 0.2. In this case, 0.2 multiplied by $25 equals $5. Adding the tip amount to the cost of the meal gives you $25 + $5 = $30.

Therefore, the total cost of the dinner, including the tip, is $30. However, it's important to note that the initial tip amount of 20% is calculated based on the cost of the meal before tax. If there are additional taxes or fees, they would be added to the total cost of $30 to get the final amount.

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The derivative of the function f(x, y) = arctan(y/x) at point (−3, 3) is  1/3√2.

To find the derivative of the function f(x, y) = arctan(y/x) at the point (-3, 3) in the direction the function increases most rapidly, we first need to find the gradient of the function.

The gradient of a scalar function f(x, y) is given by the vector (∂f/∂x, ∂f/∂y).

Let's find these partial derivatives:
∂f/∂x = (-y)/(x^2 + y^2)
∂f/∂y = (x)/(x^2 + y^2)
Now, let's evaluate these partial derivatives at point (-3, 3):

∂f/∂x(-3, 3) = (-3)/((-3)^2 + 3^2) = 3/18 = -1/6
∂f/∂y(-3, 3) = (3)/((-3)^2 + 3^2) = -3/18 = 1/6

So, the gradient of f at the point (-3, 3) is (-1/6, 1/6).

To find the derivative of f in this direction, we need to take the dot product of the gradient vector with the unit vector in the direction of (-1/6, 1/6):

|(-1/6, 1/6)| = √-1/6²+ 1/6² = 1/3√2

So, the unit vector in the direction of (-1/6, 1/6) is given by:

u = (-1/6, 1/6) / (1/3√2) = (-1/√2, 1/√2)

The derivative of f in the direction of u is given by:

D(u)f = grad(f)(-3,3) · u

= (-1/6, 1/6) · (-1/sqrt(2), 1/sqrt(2))

= 1/6√2 + 1/6√2

= 1/3√2

Therefore, the derivative of f at (-3,3) in the direction of the vector (-1/6, 1/6) is 1/3√2.

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The grocer needs to mix 1 pound of the first kind of candy and 22 pounds of the second kind of candy to get 23 pounds of the new mix that will sell for $1.90 per pound.

Let's assume that the grocer needs to mix x pounds of the first kind of candy and y pounds of the second kind of candy to get a total of 23 pounds of the new mix.

We know that the new mix will sell for $1.90 per pound, so the total revenue from selling the new mix will be:

Revenue = $1.90 × 23 = $43.70

We can set up a system of equations based on the total weight of the mix and the total cost of the mix:

x + y = 23 (total weight of the mix)

0.95x + 1.90y = 43.70 (total cost of the mix)

We can solve this system of equations using substitution or elimination method. Here, we will use substitution:

x + y = 23

y = 23 - x (subtracting x from both sides)

0.95x + 1.90y = 43.70

0.95x + 1.90(23 - x) = 43.70 (substituting y = 23 - x)

0.95x + 43.70 - 1.90x = 43.70

-0.95x = -0.95

x = 1

Therefore, the grocer needs to mix 1 pound of the first kind of candy and 22 pounds of the second kind of candy to get 23 pounds of the new mix that will sell for $1.90 per pound.

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For which positive integers k is the following series convergent? k > 1.The limit of the ratio will be 0 for k > 1, and the series converges for those values.

Determine for which positive integers k the following series is convergent, we need to analyze the series:
Σ [(n!)^2 / (kn)!], with n starting from 1 and going to infinity.
We will use the Ratio Test to check for convergence.

The Ratio Test states that if the limit as n approaches infinity of the absolute value of the ratio of consecutive terms (a_n+1 / a_n) is less than 1, the series converges.
First, we find the ratio of consecutive terms:
[(n+1)!]^2 / (k(n+1))! * (kn)! / [(n!)^2] = [(n+1)!]^2 * (kn)! / [(n!)^2 * (k(n+1))!]
Simplify the expression:
(n+1)^2 * (kn)! / [(n!)^2 * k * (kn + k)!]
Now, take the limit as n approaches infinity:
lim (n→∞) [(n+1)^2 * (kn)! / [(n!)^2 * k * (kn + k)!]]
As n approaches infinity, the denominator will grow faster than the numerator for k > 1. This is because the factorial function grows faster than a polynomial, and the extra k term in the denominator makes the denominator grow even faster for larger k values.
Therefore, the limit of the ratio will be 0 for k > 1, and the series converges for those values:
For which positive integers k is the following series convergent? k > 1.

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Option E (A and C only) is the correct answer. Subject variables refer to qualities or characteristics of the participants in a study that cannot be manipulated by the experimenter, such as age, gender, personality traits, etc.

These variables are traditionally used to group participants based on those qualities or traits, and they can have an impact on the outcome of the study. However, subject variables are not considered to be independent variables, as they are not manipulated by the experimenter. Independent variables are manipulated in an experiment to observe their effect on the dependent variable. It is important for researchers to control for subject variables by either stratifying or randomizing participants to ensure that any observed differences between groups are not due to differences in the subject variables. Therefore, option A is true because subject variables cannot be manipulated by the experimenter, and option C is true because subject variables refer to qualities or characteristics of the participants themselves.

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1. When the scientist started, there were 1.9477 thousand frogs

2. The frog population in month 17 is 1.2499 thousand frogs.

3.  The frog population will be above 400 frogs in 3rd month.

1. To find how many frogs were there when the scientist started, we need to find the population at month 0, which can be calculated by evaluating S(x) at x = 0:

[tex]S(0) =-0.0523 - 25(0)^2 + 6.34(0) + 2[/tex]

         =  1.9477    

   Therefore, there were approximately 1.9477 thousand (1,947.7) frogs when the scientist started.

2. To find the approximate frog population in month 17, we need to evaluate S(x) at x = 17:

[tex]S(17) =-0.0523 - 25(17)^2 + 6.34(17) + 2[/tex]

≈ 1.2499

   Therefore, the approximate frog population in month 17 is 1.2499 thousand (1,249.9) frogs.

3. To find the approximate frog population in month 17, we need to solve the equation S(x) = 0.4 (since S(x) is in thousands):

[tex]-0.0523 - 25x^2 + 6.34x + 2 = 0.4[/tex]

Simplifying and rearranging, we get:

[tex]25x^2 - 6.34x + 2.4523 = 0[/tex]

Using the quadratic formula, we can solve for x:

[tex]x = (-b \pm \sqrt{(b^2 - 4ac)}) / 2a[/tex]

where a = 25, b = -6.34, and c = 2.4523

Plugging in the values, we get:

[tex]x = (-(-6.34) \pm \sqrt{((-6.34)^2 - 4(25)(2.4523))}) / 2(25)[/tex]

x ≈ 2.56 or x ≈ 0.16

We can ignore the negative root since the population cannot be negative.

Therefore, the frog population will be above 400 frogs in approximately the 3rd month (since we started counting from x = 0).

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The coefficient of correlation is r = 0.9

Given data ,

The coefficient of correlation, denoted by r, is the square root of the coefficient of determination (r²).

Now , the coefficient of determination is given as 0.81.

Therefore, the coefficient of correlation can be calculated as follows:

Taking the square root of the coefficient of determination , we get:

r = √(0.81)

On further simplification , we get:

The square root of 0.81 = 0.9

r ≈ 0.9

Therefore, the value of r = 0.9

Hence, the coefficient of correlation is approximately 0.9

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the value of f(-2) is approximately 0.540.

To solve the differential equation dy/dx = e^x - e^y, we can use separation of variables:

dy / (e^y - e^x) = e^x dx

Integrating both sides, we get:

ln|e^y - e^x| = e^x + C

where C is the constant of integration. Since y = f(x) is a particular solution, we can use the initial condition f(1) = 0 to find C:

ln|e^0 - e^1| = 1 + C

ln(1 - e) = 1 + C

C = ln(1 - e) - 1

Substituting this value of C back into the general solution, we get:

ln|e^y - e^x| = e^x + ln(1 - e) - 1

Taking the exponential of both sides, we get:

|e^y - e^x| = e^(e^x) * e^(ln(1 - e) - 1)

Simplifying the right-hand side, we get:

|e^y - e^x| = e^(e^x - 1) * (1 - e)

Since f(1) = 0, we know that e^y - e^1 = 0, or equivalently, e^y = e. Therefore, we have:

|e - e^x| = e^(e^x - 1) * (1 - e)

Solving for y in terms of x, we get:

e - e^x = e^(e^x - 1) * (1 - e) or e^x - e = e^(e^y - 1) * (e - 1)

We can now use the initial condition f(1) = 0 to find the value of f(-2):

f(-2) = y when x = -2

Substituting x = -2 into the equation above, we get:

e^(-2) - e = e^(e^y - 1) * (e - 1)

Solving for e^y, we get:

e^y = ln((e^(-2) - e)/(e - 1)) + 1

e^y = ln(1 - e^(2))/(e - 1) + 1

Substituting this value of e^y into the expression for f(-2), we get:

f(-2) = ln(ln(1 - e^(2))/(e - 1) + 1)

Using a calculator, we get:

f(-2) ≈ 0.540

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The statement ''Multiple linear regression allows for the effect of potential confounding variables to be controlled for in the analysis of a relationship between X and Y'' is true because -

Multiple linear regression allows for the inclusion of multiple independent variables, which can help control for the influence of confounding variables by statistically adjusting their effects on the relationship between the dependent variable (Y) and the main independent variable of interest (X).

In simple linear regression, we analyze the relationship between a single independent variable (X) and a dependent variable (Y).

However, in real-world scenarios, the relationship between X and Y may be influenced by other variables that can confound or affect the relationship.

Multiple linear regression addresses this by including multiple independent variables (X1, X2, X3, etc.) in the analysis.

By incorporating these additional variables, we can account for their potential influence on the relationship between X and Y.

The coefficients associated with each independent variable in the regression model represent the unique contribution of that variable while controlling for the other variables.

Controlling for potential confounding variables helps to isolate the relationship between X and Y, allowing us to assess the specific impact of X on Y while considering the effects of other variables.

This enhances the validity and accuracy of the analysis, providing a more comprehensive understanding of the relationship between X and Y.

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The average rate of change of a function from x = -4 to x = 2 can be determined by finding the slope of the line connecting the two points on the graph corresponding to these x-values.

To find the average rate of change of a function from x = -4 to x = 2, we need to calculate the slope of the line connecting the two points on the graph. The average rate of change represents the average rate at which the function is changing over the given interval.

First, we identify the coordinates of the two points on the graph corresponding to x = -4 and x = 2. Let's assume the coordinates of the points are (-4, f(-4)) and (2, f(2)), where f(x) represents the function.

Next, we calculate the slope of the line connecting these two points using the formula: slope = (change in y) / (change in x). The change in y can be found by subtracting the y-coordinate of the first point from the y-coordinate of the second point, and the change in x is obtained by subtracting the x-coordinate of the first point from the x-coordinate of the second point.

Finally, we divide the change in y by the change in x to obtain the average rate of change. This value represents the average rate at which the function is changing over the interval from x = -4 to x = 2.

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The eigenvalues and eigenvectors are greater than 1, it means that the transformation stretches the space along that direction.

To find the matrix A in the linear transformation y = Ax, we first need to know what the transformation does to each basis vector.

The geometric meaning of the eigenvalues and eigenvectors depends on the specific transformation encoded by the matrix A.

In general, the eigenvectors represent the directions along which the transformation stretches or compresses the space, while the eigenvalues indicate the magnitude of the stretching or compression. If an eigenvector has an eigenvalue of 1, it means that the transformation leaves that direction unchanged.

If an eigenvector has an eigenvalue greater than 1, it means that the transformation stretches the space along that direction. Conversely, if an eigenvector has an eigenvalue between 0 and 1, it means that the transformation compresses the space along that direction.

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Abella paid $2.40 for a dozen eggs last month and $3.00 for the same number of eggs this month.

The percentage increase in the price of the eggs this month can be calculated as follows:

Step 1: Calculate the difference in prices from last month to this month

$3.00 - $2.40 = $0.60

Step 2: Calculate the percentage increase in price

Percentage increase in price = (Increase in price / Original price) x 100%

Percentage increase in price = ($0.60 / $2.40) x 100%

Percentage increase in price = 0.25 x 100%

Percentage increase in price = 25%

Therefore, the percentage increase in the price of the eggs this month is 25%.

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The average intrinsic enterprise value for this company is approximately 436,977.

To calculate the intrinsic enterprise value, we need to consider multiple methods, such as the EV/EBITDA multiple and the perpetual growth method. Both of these methods involve making predictions about the company's future financial performance and using those predictions to estimate its overall value.

Now, let's talk about how we can use the average of these methods to calculate the intrinsic enterprise value. First, we need to gather some data. The numbers you provided - 485,416, 387,294, 451,512, and 421,684 - are likely the results of applying the EV/EBITDA and perpetual growth methods to the company in question.

To calculate the average intrinsic enterprise value, we simply add up these numbers and divide by the total number of values. In this case, we have four values, so we'll add them up and divide by four:

(485,416 + 387,294 + 451,512 + 421,684) / 4 = 436,977

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The length of the arc in terms of pi is 3π units.

The length of the arc is calculated by applying the formula for the length of arc as shown below;

L = 2πr (θ/360)

where;

The length of the arc in terms of pi is calculated as follows;

L = 2π x 9 (60/360)

L = 3π units

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It took approximately 13.9 hours for the antibiotic to reduce the number of bacteria from 2 million to 0.5 million, based on a decay rate of 0.05 per hour.

The decay of bacteria can be modeled using exponential decay, where the rate of decay is proportional to the current population. In this case, the decay rate is given as k = 0.05 per hour.

We can use the exponential decay formula: N(t) = N₀ * [tex]e^{-kt}[/tex], where N(t) is the population at time t, N₀ is the initial population, k is the decay rate, and e is the base of the natural logarithm.

Given that N₀ = 2 million and N(t) = 0.5 million, we can solve for t. Plugging in the values into the formula, we get:

0.5 million = 2 million * [tex]e^{-0.05t}[/tex]

Dividing both sides by 2 million, we have:

0.25 = [tex]e^{-0.05t}[/tex]

Taking the natural logarithm of both sides to isolate the exponent, we get:

ln(0.25) = -0.05t

Solving for t, we have:

t = (ln(0.25)) / (-0.05) ≈ 13.9 hours

Therefore, it took approximately 13.9 hours for the antibiotic to reduce the number of bacteria from 2 million to 0.5 million.

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The difference betwen the lengths of the eagle and bear trails is (3 + 9/10) miles.

Here we just need to take the difference between the two given mixed numbers, to do that, we can group the whole parts and the fraction parts, we will get:

difference = (6 + 3/5) mi - (2 + 7/10) mi

difference = (6 - 2) + (3/5 - 7/10)

                 =  4 + 6/10 - 7/10

                 = 4 - 1/10 = 3 + 9/10

The difference betwen the lengths is (3 + 9/10) miles.

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The solution for 3 on the interval [0, 2) is 3 = π/6, 13π/6 or 30°, 390°.

To solve for 3 from sin(3) = 1/2 on the interval [0, 2), we need to use the inverse sine function (arcsin) and solve for the angle whose sine is equal to 1/2.
arcsin(1/2) = 30° or π/6 radians
Since the interval is [0, 2), we need to add 2π to the angle if it is less than 0 or greater than or equal to 2π.
So, the solution for 3 on the given interval is:
3 = π/6 or 30°, or
3 = π/6 + 2π = 13π/6 or 390°
Therefore, the solution for 3 on the interval [0, 2) is 3 = π/6, 13π/6 or 30°, 390°.

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I'm sorry, but the question seems incomplete or there may be some typos. It is not clear what is meant by "ER=0(On – Rm) < 0.1 means normal". Additionally, there are some missing values in the table. Can you please provide more information or clarify the question?

To calculate the percent increase between the original quantity (15) and the new quantity (24), we use the formula: Percent increase = [(new quantity - original quantity) / original quantity] * 100. The result represents the percentage by which the quantity has increased.

To find the percent increase between the original quantity (15) and the new quantity (24), we subtract the original quantity from the new quantity and divide it by the original quantity. The formula is:
Percent increase = [(new quantity - original quantity) / original quantity] * 100
Substituting the given values:
Percent increase = [(24 - 15) / 15] * 100
= (9 / 15) * 100
= 0.6 * 100
= 60%
Therefore, the percent increase between the original quantity of 15 and the new quantity of 24 is 60%. This means that the quantity has increased by 60% from the original value.

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Answer:

The change is exponential growth and the percent increase is 57.3%

Step-by-step explanation:

An exponential growth function is represented by the equation

f(x)=a(1+r)^t

As such r is equal to 0.573, or 57.3%