the equations 6x + 5y = 28 and 10x + 14y = 58 represent the cost for lunch and dinner for a family eating out on vacation. if x is the number of adults and y is the number of children, how many adults are in the family?

Answer:[tex]y\leq 7[/tex]

Step-by-step explanation: To solve the inequality we can start by isolating y on one side of the inequality by subtracting 15 from both sides

2y+15-15[tex]\leq[/tex]29-15

this simplifies to 2y[tex]\leq[/tex]14

Next, we can isolate y by dividing both sides by 2: 2y/2[tex]\leq[/tex]14/2

simplifying further gives y[tex]\leq[/tex]7 therefore the answer is y[tex]\leq[/tex]7

Answer:

Part A:

Let's assume the width of the garden is x. The length is 4 feet longer than the width, so it's (x+4). The area is 60 sq ft, so the equation is: x^2 + 4x - 60 = 0.

Part B:

To solve for x, we factor the equation: (x+10)(x-6) = 0. The width can't be negative, so x=6. The length is x+4=10. The garden is 10ft by 6ft.

Answer:

The slope of the line passing through the points (-6,-5) and (-1,1) can be found using the formula:

slope = (y2 - y1) / (x2 - x1)

where (x1, y1) = (-6,-5) and (x2, y2) = (-1,1)

slope = (1 - (-5)) / (-1 - (-6)) = 6/5

Now, using point-slope form of the equation of a line, we get:

y - y1 = m(x - x1)

where m = 6/5 and (x1, y1) = (-6,-5)

y + 5 = 6/5(x + 6)

y + 5 = 6/5x + 6.72

y = 6/5x + 6.72 - 5

y = 6/5x + 1.72

Therefore, the equation of the line passing through the points (-6,-5) and (-1,1) is:

y = 6/5x + 1.72

Option (c) y=6/5x is not the correct equation of the line. The correct answer is (d) y=6/5x + 11/6.

Answer:

Step-by-step explanation:

The circumference of the bicycle wheel can be determined by the formula:

Circumference = π x diameter

where π (pi) is a mathematical constant equal to approximately 3.14.

Substituting the given diameter of 1.25 ft, we get:

Circumference = 3.14 x 1.25 ft

Circumference = 3.925 ft (rounded to three decimal places)

Each revolution of the wheel covers a distance equal to the circumference of the wheel. Therefore, if the odometer recorded 254 revolutions, the distance covered by the bicycle is:

Distance = 254 x Circumference

Distance = 254 x 3.925 ft

Distance = 996.95 ft (rounded to two decimal places)

Therefore, the bicycle traveled approximately 996.95 feet.

Kim needs a total area of 225.92 square inches of construction paper for her project.

To find the total square inches of construction paper that Kim needs for her project, we need to calculate the area of each rectangle and then add them together.

For the first rectangle that is 9 inches × 13 1/3 inches, we can calculate its area as follows:

Area = Length × Width = 9 in × 13 1/3 in

To multiply 13 1/3 by 9, we can convert 13 1/3 to a fraction and multiply:

13 1/3 = 40/3, so:

Area = 9 in × (40/3) in = 360/3 in^2 = 120 in^2

For the second rectangle that is 10 1/4 inches by 10 1/3 inches, we can calculate its area as follows:

Area = Length × Width = (10 1/4 in) × (10 1/3 in)

To multiply 10 1/4 by 10 1/3, we can convert both numbers to fractions and multiply:

10 1/4 = 41/4 and 10 1/3 = 31/3, so:

Area = (41/4 in) × (31/3 in) = 1271/12 in^2 ≈ 105.92 in^2

Now, we can add the two areas to find the total area of construction paper that Kim needs:

Total area = 120 in^2 + 105.92 in^2 = 225.92 in^2

Therefore, Kim needs a total of 225.92 square inches.

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Therefore , the solution of the given problem of angle comes out to be  response is 122 degrees.

The walls in the top and bottom split the circular lines making up a skew's extremities using Cartesian coordinates. It is possible for two beams to converge at a junction spot. Another result of two objects interacting is an angle. They most closely resemble dihedral forms. Two line beams can be arranged in different ways at their ends to form a two-dimensional curve.

Here,

A straight path has a total of 180 degrees in angles. By deducting the known angle from 180 degrees, we can determine the measure of

the unknown angle if we have a straight line and a 58-degree angle.

As a result, the undetermined angle's measurement is:

=> 180° - 58° = 122°

The response is 122 degrees.

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Answer:

area=36.5

Step-by-step explanation:

8×4=32

8-5=3 for the base of the triangle

7-4=3 for the height of the triangle

3×3=9

9÷2=4.5

4.5+32=36.5

area=36.5

Answer:

Step-by-step explanation: If Nina fills 10 bags, each with 3 treats, she would have a total of 30 treats (10 bags x 3 treats per bag). If she fills 20 bags, she would have 60 treats (20 bags x 3 treats per bag). If she fills 30 bags, she would have 90 treats (30 bags x 3 treats per bag). Since she only has 78 treats, she can fill between 10 and 20 bags, but not more than 20 bags.

If she fills 10 bags, she would use 30 treats, leaving her with 48 treats. If she fills 11 bags, she would use 33 treats, leaving her with 45 treats, which is not enough to fill another bag. Therefore, she can fill fewer than 11 bags, but not more than 20 bags.

The union and intersection of n sets that are all subsets of the universal set u can be found using bit strings.

Bit strings are a way of representing sets as strings of binary digits. To represent a set, each element is assigned a digit of 0 or 1. A 1 indicates that the element is in the set, while a 0 indicates that the element is not in the set.

The union of the sets is found by combining the bit strings and setting any digit that is 1 in any of the sets to a 1. The intersection is found by comparing the bit strings and setting any digit that is 1 in all of the sets to a 1.

By using bit strings, we can quickly and accurately find the union and intersection of n sets that are all subsets of the universal set u.

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The probability of Felipe winning a prize is 1/5 or 0.2.

As per given equation:

Odds in favor of Felipe winning a prize is

Probability of an event is given by

P(event) = Number of favorable outcomes/ Total number of outcomes

In the given problem, the odds in favor of Felipe winning a prize are.

Hence, the probability of Felipe winning a prize is

P(win) = Number of favorable outcomes/ Total number of outcomes

Let us assume that there are x favorable outcomes and y total outcomes.

Then, according to the odds, we have x : y-x or x : y

There are two possibilities for x and y-x.

Thus, the total number of outcomes will be:

Total number of outcomes = x + (y - x) = y

Therefore, we have P(win) = x/y

Since the odds in favor of Felipe winning a prize are , we have x : y-x = :

That is, x:y-x = 1:4

This means that if x is 1, then y-x is 4.

So, the total number of outcomes is:

Total number of outcomes = x + (y - x) = 1 + 4 = 5

Hence, the probability of Felipe winning a prize is:

P(win) = x/y= 1/5

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The probability of selecting a brown bead from the bowl is 2/7 or approximately 0.29.

The probability of an event is calculated by dividing the number of favorable outcomes by the total number of possible outcomes.

The probability of selecting a brown bead can be calculated by dividing the number of brown beads by the total number of beads in the bowl:

Probability of selecting a brown bead = Number of brown beads / Total number of beads

In this case, there are 4 brown beads out of a total of 14 beads:

Probability of selecting a brown bead = 4 / 14

Simplifying this fraction, we get:

Probability of selecting a brown bead = 2 / 7

Therefore, the probability of selecting a brown bead from the bowl is 2/7 or approximately 0.29 (rounded to two decimal places).

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Answer:

The surface area of the prism is 96 cm²

Step-by-step explanation:

What is surface area? Surface area is the sum of the areas of all the faces (or surfaces) of a three-dimensional object. The length and width of the rectangular face are 4.5 cm and 3 cm, respectively, so the area is:4.5 cm x 3 cm = 13.5 cm²Since there are two rectangular faces on the prism, the total area for the pair is:= 2 x 13.5 cm² = 27 cm²Similarly for the another face3 cm x 3 cm = 9 cm²Since there are two square faces on the prism, the total area for the pair is:= 2 x 9 cm² = 18 cm²The area of one of the rectangular faces that is not congruent to the first two:= 8.5 cm x 3 cm = 25.5 cm²Since there are two rectangular faces that are not congruent to the first two, the total area for the pair is:= 2 x 25.5 cm² = 51 cm²Now we can find the total surface area by adding the area of each pair of faces:= 27 cm² + 18 cm² + 51 cm² = 96 cm²Therefore, the surface area of the rectangular prism is 96 square centimeters.

The dimensions of the worksheet are 15 inches by 9 inches.

According to the question a worksheet has a perimeter of 48 inches and an area of 135 square inches. The dimensions of the worksheet are to be found.To find the dimensions of the worksheet we have to follow the steps given below:

Step 1: Let’s assume the dimensions of the worksheet are L and B.

Step 2: Calculate the perimeter of the worksheet which is the sum of all the sides of the worksheet.Perimeter of a worksheet= 2(L + B) = 48 inches⇒ L + B = 24

Step 3: Calculate the area of the worksheet which is the product of the length and breadth of the worksheet.Area of the worksheet = L × B = 135 square inches.

Step 4: Find the values of L and B by solving the equations L + B = 24 and L × B = 135 by substitution.The value of B can be found by substituting L = 24 - B. in the second equation.L × B = 135(24 - B) × B = 13524B - B² = 135B² - 24B + 135 = 0B = (24 ± √(24² - 4 × 135)) / 2 = 9 or 15(As the dimensions can’t be negative, we choose B = 9)When B = 9L = 24 - 9 = 15.

Thus, the dimensions of the worksheet are L = 15 inches and B = 9 inches.In other words, the dimensions of the worksheet are 15 inches by 9 inches.

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As per the confidence interval, the population variance is between 67.9 and 186.6 and the population standard deviation is between 8.24 and 13.67 inches.

To construct a 95% confidence interval for the population variance, we use the chi-squared distribution. The formula for the confidence interval is:

[ (n-1) x s² / chi-squared(α/2, n-1), (n-1)*s² / chi-squared(1 - α/2, n-1) ]

where n is the sample size, s is the sample standard deviation, alpha is the level of significance (in this case, alpha = 0.05), and chi-squared(alpha/2, n-1) and chi-squared(1-alpha/2, n-1) are the values from the chi-squared distribution that correspond to the upper and lower limits of the confidence interval.

Plugging in the numbers, we get:

[ (298.18²) / chi-squared(0.025, 29), (298.18²) / chi-squared(0.975, 29) ]

Using a chi-squared distribution, we find that chi-squared(0.025, 29) = 16.05 and chi-squared(0.975, 29) = 44.07. Therefore, the confidence interval for the population variance is:

[ 2994.6 / 44.07, 2994.6 / 16.05 ] = [ 67.9, 186.6 ]

To construct a 95% confidence interval for the population standard deviation, we take the square root of both ends of the interval for the population variance. Therefore, the confidence interval for the population standard deviation is:

[ √(67.9), √(186.6) ] = [ 8.24, 13.67 ]

Interpreting the results, we can say that we are 95% confident that the true population variance of annual precipitations in San Francisco falls between 67.9 and 186.6 square inches. Similarly, we are 95% confident that the true population standard deviation falls between 8.24 and 13.67 inches.

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As a result, we are unable to determine the age of a child who is 133 cm tall using the regression equation.

A statistical technique called linear regression is used to represent the connection between two variables, where one of the variables is the dependent variable and the other is the independent variable. Finding the best-fit line that depicts the connection between the two variables is the objective of linear regression. This enables us to make predictions or estimate values based on the known data.

given

These numbers allow us to determine a and b:

a = 0.997 (9.285 / 1.547) ≈ 5.977

b = 128.2 - 5.977 (8.02) ≈ 81.704

The regression equation is therefore y = 5.977 x + 81.704.

(ii) Based on the calculations made above, the Pearson's product-moment correlation coefficient, or r, has a value of roughly 0.997.

(b) We enter x = 9 into the regression equation to calculate an approximation of the height of a 9-year-old child:

As a result, we calculate that a 9-year-old kid will be roughly 134.6 cm tall.

We must resolve the regression equation for x in order to determine the age of a kid who measures 133 cm in height.

x = (y - b) / a

This calculation, though, would result in an illogically negative age. As a result, we are unable to determine the age of a child who is 133 cm tall using the regression equation.

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The complete question is:-  

The following table shows the mean height, y cm, of primary school children who are age x years old.

Age, x years Mean Height, y cm

6.25 7.35 8.5 9.25 10.75

115 121 129 136 140

The relationship between x and y can be modelled by the regression line of y on x with equation y = ax + b.

(a) (i) Find the value of a and the value of b.

(ii) Write down the value of Pearson's product-moment correlation coefficient, r.

(b) Use your regression equation from part (a)(i) to estimate the height of a child aged 9 years old.

(c) Explain why it is not appropriate to use the regression equation to estimate the age of a child who is 133 cm tall.

Hypothesis testing is an important step when using sample data to estimate a population-level relationship because it helps ensure that the conclusions drawn from the data are accurate.

Hypothesis testing allows us to determine the probability that the observed results are due to chance, rather than reflecting a real relationship between the variables. When constructing a hypothesis, we set up two competing hypotheses, the null and the alternative. The null hypothesis states that there is no relationship between the variables and that the observed results are due to chance. The alternative hypothesis states that there is a relationship between the variables and that the observed results are not due to chance.

We can then use the sample data to conduct a test of statistical significance to compare the results of the two hypotheses. This test helps us determine whether the observed results are due to chance or if they are significant enough to suggest a real relationship between the variables. In conclusion, hypothesis testing is essential when using sample data to estimate a population-level relationship because it allows us to determine the probability that the observed results are due to chance, rather than reflecting a real relationship between the variables.

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The value 3.915 represents the y-intercept or the initial or baseline water lily population when there are no changes in the independent variable (x). the coefficient 1.106 represents the slope of the regression line or the rate of change in the dependent variable (y).

In the regression equation y = 3.915(1.106)x, the coefficient 3.915 represents the y-intercept or the value of y when x is 0. In the context of the water lily population change, this means that when there are no changes in the independent variable (x), the predicted value of the dependent variable (y) is 3.915, which represents the initial or baseline water lily population.

The coefficient 1.106 represents  rate of change in the dependent variable (y) per unit change in the independent variable (x) or the  the slope of regression line . In the context of the water lily population change, this means that for every unit increase in the independent variable (which could be time, environmental factors, or any other relevant variable), the predicted value of the dependent variable (y) increases by a factor of 1.106. In other words, the water lily population is expected to grow by 1.106 times for every unit increase in the relevant variable.

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____The given question is incomplete, the complete question is given below:

The regression equation you found for the water lilies is y = 3.915(1.106)x.

In terms of the water lily population change, the value 3.915 represents:

The value 1.106 represents:

Answer:

The value of 3.915 is the initial number

of water lilies. It is approximately 4, which matches

the data.

The value 1.106 is the growth rate. The rate represents growth for each day. The percentage growth each day is 10.6%

Step-by-step explanation:

The patient will have to pay $1,260 for the $4,600 medical bill from the emergency room visit.

Here's how the calculation works:

The patient needs to meet the $3,000 deductible first. So the insurance company won't pay anything until the patient has paid $3,000 out of their own pocket.

After the deductible is met, the co-insurance kicks in. The patient is responsible for paying 20% of the remaining cost of the medical bill, and the insurance company will cover the other 80%. In this case, the remaining cost is $4,600 - $3,000 = $1,600. So the patient will have to pay 20% of $1,600, which is $320.

The total amount that the patient has paid so far is $3,000 (deductible) + $320 (co-insurance) = $3,320.

However, the plan has an out-of-pocket maximum of $6,000. This means that once the patient has paid $6,000 in deductibles, co-insurance, and copays for the year, the insurance company will cover 100% of the remaining costs. In this case, the patient has not yet reached the out-of-pocket maximum, so they still have to pay more.

Finally, the plan has an emergency copay of $500. This means that the patient will have to pay $500 for the emergency room visit, in addition to the deductible and co-insurance. So the total amount that the patient will have to pay is $3,320 + $500 = $3,820.

Note that the primary copay of $40 doesn't apply in this case, since it only applies to primary care visits, not emergency room visits.

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The number of bacteria after 5 hours with initial numbers 3500 increased double in each hour is equal to 112,000.

Initially number of bacteria in a culture =  3500

Total hours the number of bacteria double = Each hour

Then the growth rate is equal to  2

As the number of bacteria after each hour is twice the previous numbers.

Formula used for the number of bacteria after t hours ,

N = N₀ x 2^t

where N₀ is the initial number of bacteria.

Time in hours = t hours

And N is the number of bacteria after t hours.

After 5 hours, the number of bacteria present is equal to,

⇒N = 3500 x 2^5

⇒N = 3500 x 32

⇒N = 112,000

Therefore, number of bacteria present after 5 hours is equal to 112,000.

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Answer:

Sam made 21 shots, and Wil made 27 shots.

Choir B has a higher percentage of students who like musicals.

what is percentage ?

Percentage is a way of expressing a proportion or a fraction out of 100. It is a widely used concept in mathematics, finance, statistics, and other fields. For example, if 20 out of 100 students in a class like pizza, we can say that the percentage of students who like pizza is 20%. To calculate the percentage, we usually multiply the given fraction by 100. For instance, if 3 out of 5 students like math, we can calculate the percentage of students who like math as follows:

(3/5) x 100 = 60%

Thus, 60% of the students in the class like math.

To determine which choir has a higher percentage of students who like musicals, we need to calculate the percentage of students in each choir who like musicals.

For choir A, 39 out of 52 students like musicals:

39/52 = 0.75 or 75%

For choir B, 35 out of 44 students like musicals:

35/44 = 0.795 or 79.5%

Therefore, choir B has a higher percentage of students who like musicals.

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In response to stated question, we may state that You will need to stitch about 5.0089 metres of piping around the outside border of the area tablecloth, rounded to the closest 0.1 m, for a total length of 5.0 m.

The size of just an area on either a surface can be represented as an area. The area of an open surface or the border of a two half object is called to as the surface area, meanwhile the area of a horizontal region or planar region pertains to the area of a shape or planar layer. The entire amount of space occupied by a horizontal (2-D) surface or form of an item is referred as its area. With a pencil, draw an square on a sheet of paper. A two-dimensional character. The area of a form on paper is the quantity of area it takes up. Consider the square to be made up of smaller unit squares.

Begin by calculating the radius of the circular tablecloth. We know that the formula A = r2 gives the area of a circle, where A is the area and r is the radius. Hence we may rearrange this formula to find r:

r = √(A/π) = √(2/π) ≈ 0.7979 m (rounded to four decimal places) (rounded to four decimal places)

Now we must determine the circumference of the circle, which is the distance around the tablecloth's outside border. The circumference is calculated using the formula C = 2r.

C = 2π(0.7979) ≈ 5.0089 m

You will need to stitch about 5.0089 metres of piping around the outside border of the tablecloth, rounded to the closest 0.1 m, for a total length of 5.0 m.

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From the given information provided, m is multiplied by 6m-7 so that the product is 6m²-7m.

To find what is multiplied by 6m-7 so that the product is 6m²-7m, we can use polynomial long division or factorization. Here's how to do it using factorization:

We need to find two numbers that multiply to give 6m²-7m and add up to -7. We can factor the expression 6m²-7m as:

6m² - 7m = m(6m - 7)

So, we see that 6m-7 is a factor of 6m²-7m. Therefore, to find what is multiplied by 6m-7 to get 6m²-7m, we just need to divide 6m²-7m by 6m-7:

(6m² - 7m) / (6m - 7) = m

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This problem can be solved using the binomial distribution, where the probability of success is $p=\frac{1}{5}$ and the number of trials is $n=7$.

The probability of exactly $k$ successes in $n$ trials is given by the formula:

$P(X=k) = \binom{n}{k} p^k (1-p)^{n-k}$

where $\binom{n}{k}$ is the binomial coefficient.

For this problem, we want to find $P(X=4)$, which is:

$P(X=4) = \binom{7}{4} \left(\frac{1}{5}\right)^4 \left(\frac{4}{5}\right)^3$

Evaluating this expression, we get:

$P(X=4) = \frac{35}{78125} \approx 0.000448$

Therefore, the probability that exactly 4 of the 7 islands have treasure is approximately 0.000448, or about 0.045%.

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Answer: c

Step-by-step explanation:

The function has an inverse that is also a function is g(x)=2x-3

A function that can turn into another function is known as an inverse function or anti function. In other terms, the inverse of a function "f" will take y to x if any function "f" takes x to y. The inverse function is designated by f⁻¹ or F⁻¹ if the function is written by f or F. Here, (-1) should not be confused with an exponent or an inverse.

A function takes in values, applies specific procedures to them, and produces an output. The inverse function works, agrees with the outcome, and returns to the initial function.

The solution in which x and y have been reversed is known as an inverse function.

The vertical line test determines whether a function succeeds or fails when you solve for y once more.

1. Here g(x) = 2x - 3 has inverse x = 2y - 3 which simplifies to;

[tex]y=\frac{x-3}{2}[/tex]

This is a line and is a function;

[tex]y=\frac{x}{2} +\frac{1}{2}[/tex]

2. k(x) = -9x² has the inverse x = -9y² which simplifies to;

[tex]y=\sqrt{x/(-9)}[/tex]

This is a function but only for certain values of x.

3. f(x) = |x+2| is an absolute value function.

Not all absolute value functions have function-based inverses.

4. A function's inverse does not exist for the equation w(x) = -20.

The function therefore has a negative that is also a function, which is

g(x)= 2x – 3.

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The domain and range of the function is (-∞, ∞),  (-∞, 18]

A function is a rule that gives each element from the domain set to a single element from the range set. The range is the set of values that the function can take, whereas the domain is the set of values for which the function is defined.

Consider the function f(x) = x^2, for instance. As the function may be defined for any value of x, the domain of this function includes all real numbers. Nevertheless, as the function may only accept values larger than or equal to zero, the range is limited to non-negative real numbers.

a. The domain and range of the function f(x) = -2x² + 8x + 10 are;

domain = (-∞, ∞)

range = (-∞, 18]

b. The domain and range of the function is;

domain = [0, 12]

range = [0, 18]

c. The domain and range of the function are;

domain = (-∞, ∞)

range = [-7, ∞)

d. The domain and range of the function are;

domain = (-∞, ∞)

range = [1, ∞)

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a. To find the equation for the surface area of the rectangular box with a square base of side x and height y, you need to consider all the faces of the box. The box has two square faces with side x, and four rectangular faces with dimensions x and y.

Explanation:

The equation for the surface area S(x,y) can be calculated as follows:

S(x,y) = 2 * (area of square face) + 4 * (area of rectangular face)
S(x,y) = 2 * (x^2) + 4 * (x * y)

b. Given that the surface area of the rectangular box is 138 square feet, we can set up an equation using S(x,y) from part (a) and the given values of x = 3 feet and y = 10 feet:

138 = 2 * (3^2) + 4 * (3 * 10)

Now, we need to find the derivative of the surface area equation with respect to x (dS/dx) and y (dS/dy):

dS/dx = 4x + 4y
dS/dy = 4x

We can now plug in the given values for x and y to find dS/dx and dS/dy:

dS/dx = 4(3) + 4(10) = 12 + 40 = 52
dS/dy = 4(3) = 12

So, when x = 3 feet and y = 10 feet, dS/dx = 52 and dS/dy = 12.

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Using Pythagoras theorem, x is equal to 12.

What is Pythagorean Theorem?

The Pythagorean Theorem is a fundamental concept in mathematics that describes the relationship between the sides of a right triangle. It states that in a right triangle, the square of the length of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the lengths of the other two sides (the adjacent and opposite sides).

The Pythagorean Theorem can be written as:

a² + b² = c²

where a and b are base and perpendicular, and c = hypotenuse.

Now,

As given

Hypotenuse(c)=15

Base(b)=9

and a=x

then x²+9²=15²

x²=225-81

x²=144

x=√144

x=12

Hence,

             the value of x is 12.

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