A school, hospital, and a supermarket are located at the vertices of a right triangle formed by three highways. The school and hospital are 14.7 miles apart. The distance between the school and the supermarket is 8.82 miles, and the distance between the hospital and the supermarket is 11.76 miles.

A service road will be constructed from the main entrance of the supermarket to the highway that connects the school and hospital. What is the shortest possible length for the service road? Round to the nearest tenth.

Answers

Answer 1

Answer:

7.1 miles

Step-by-step explanation:

Consider right triangle HospitalSchoolSupermarket. In this triangle:

HospitalSchool = 14.7 mi;HospitalSupermaket = 11.76 mi;School Supermarket = 8.82 mi.

The shortest road from the main entrance of the supermarket to the highway that connects the school and hospital will be the height drawn from the point Supermarket to the hypotenuse HospitalSchool.

Let the length of this road be x mi and the distance from School to point A be y mi. Use twice the Pythagorean theorem for right triangles Supermarket SchoolA and SupermarketHospitalA:

[tex]\left\{\begin{array}{l}x^2+y^2=8.82^2\\ \\x^2+(14.7-y)^2=11.76^2\end{array}\right.[/tex]

Subtract from the second equation the first one:

[tex]x^2+(14.7-y)^2-x^2-y^2=11.76^2-8.82^2\\ \\14.7^2-2\cdot 14.7y+y^2-y^2=11.76^2-8.82^2\\ \\-29.4y=11.76^2-8.82^2-14.7^2\\ \\29.4y=155.5848\\ \\y\approx5.24\ mi[/tex]

Thus,

[tex]x^2=8.82^2-5.24^2=50.3348\\ \\x\approx 7.1\ mi.[/tex]

A School, Hospital, And A Supermarket Are Located At The Vertices Of A Right Triangle Formed By Three

Related Questions

Find the area. The figure is not drawn to scale.

Answers

The answer is B. It is the most reasonable answer that I see.

Answer:

[tex]704 in^2[/tex]

Step-by-step explanation:

The figure is a parallelogram.

The area of a parallelogram is

[tex]=base\:\:\times\:\:height[/tex]

The base is 22 inches and the height is 32 inches.

We multiply to obtain:

[tex]22\times 32=704in^2[/tex]

the correct answer is B

To join Iron Pump gym, members pay $45 per month. Ms. Curran has been a member of the gym for 3 months, and pays $200 for her membership. Write an equation that gives the total cost of the gym membership as a function of months.

Answers

Answer:

T= 200+45m

Step-by-step explanation:

m= months

T=total money

Which of the following is the third term of the expansion (a + b)^n ?
C(n, 2)a^n - 2b^2
C(n, 3)a^n - 3b
C(n, 2)a^2b^n - 2

Answers

Answer:

  C(n, 2)a^(n-2)b^2

Step-by-step explanation:

Generally, the expansion is written in decreasing powers of "a", so the first few terms would have variable constellations that look like ...

  a^n, a^(n-1)b, a^(n-2)b^2, ...

The coefficients would be (in order), C(n, k) for k increasing from 0, so the coefficient of the 3rd term would be C(n, 2).

How does the range of g(x)=6/x compare with the range of the parent function f(x)=1/x?

Answers

Final answer:

The range of the function g(x)=6/x is the same as the range of the parent function f(x)=1/x, which is all real numbers except zero, despite the scaling factor '6'. This is because transformations other than shifts do not change the range.

Explanation:

The comparison between the functions g(x)=6/x and f(x)=1/x lies in the understanding of how modifications to a parent function affect its range. The function f(x)=1/x is a parent function and its range is all real numbers except for zero. This is because as x approaches zero, the output of the function approaches infinity, thus, zero is not included in the range.

When we look at the function g(x)=6/x, the multiplier '6' just scales the values of the parent function by a factor of 6. This means the range will still be all real numbers except for zero, just like in the parent function. This is because the function transformations do not affect the range of the function that has a rational form like f(x)=1/x unless there are additional horizontal or vertical shifts.

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Matt and his dad are building a tree house. They buy enough flooring material to cover an area of 36 square ft. What are all possible dimensions of the floor?

Answers

Answer:

  Factor pairs of 36 are ...

     1×36, 2×18, 3×12, 4×9, 6×6 . . . and the reverse of these

There is nothing in the problem statement limiting the dimensions to integer numbers of feet, so any dimensions x and 36/x will do. (x in feet)

Step-by-step explanation:

Area is the product of length and width. The desired dimensions are the length and width of the floor, so any pair of numbers resulting in a product of 36 will be a possible set of dimensions.

If the dimensions are supposed to be integer numbers of feet, then the possibilities for length×width are ...

  1×36, 2×18, 3×12, 4×9, 6×6, 9×4, 12×3, 18×2, 36×1

_____

As a practical matter, the tree house probably needs to be wider than 2 feet, leaving 3×12, 4×9, and 6×6 as possible dimensions (length×width or width×length). Depending on the flooring material and the difficulty of cutting it, there may be other limitations on the dimensions.

The possible dimensions for the floor of the tree house that Matt and his dad are building are 1 ft x 36 ft, 2 ft x 18 ft, 3 ft x 12 ft, 4 ft x 9 ft, and 6 ft x 6 ft. These pairs are derived by identifying the factors of 36 square feet.

To determine all possible dimensions of the floor that Matt and his dad need to cover, we need to find pairs of whole numbers that multiply to 36 square feet. This is a classic problem in mathematics involving factors.

Here are the pairs of whole numbers that multiply to 36:

1 ft x 36 ft2 ft x 18 ft3 ft x 12 ft4 ft x 9 ft6 ft x 6 ft

Each of these pairs represents a possible dimension for the tree house floor.

How would you convert 276 yards to inches?


Add up the digits


Multiply by 36


Change the unit measure

Answers

Answer:

9936 inch.

Step-by-step explanation:

Note the measurements:

1 Yard = 3 Feet

1 Feet = 12 Inch

1 Yard = 3 Feet = (12)(3) Inches = 36 Inches; 1 Yard = 36 Inches

Multiply 276 with 36

276 x 36 = 9936

9936 inches is your answer.

~

An equation is written to represent the relationship between the temperature in Alaska during a snow storm, y, as it relates to the time in hours, x, since the storm started. A graph of the equation is created. Which quadrants of a coordinate grid should be used to display this data? Quadrant 1 only Quadrant 1 and 2 only Quadrant 4 only Quadrant 1 and 4 only

Answers

Answer:

either of ...

• quadrant 1 only

• quadrant 1 and 4 only

Step-by-step explanation:

Time since the storm started is always positive. The values of x are positive in quadrants 1 and 4.

Temperatures in a blizzard are not always terribly cold. Some of the coldest snowstorms on record have temperatures in the range of +5 °F to +18 °F. These values are negative temperatures on the Celsius scale, so the quadrant used for plotting them will depend on the temperature scale you choose.

While temperatures in Alaska can be well below zero (on either the F or C temperature scales), the air usually has to warm up to the range indicated above before it can snow. US temperatures are generally reported using the Fahrenheit scale, but weather records are often kept using the Celsius scale.

I would be inclined to choose "Quadrant 1 and 4 only", but arguments can be made for "1 only" and "4 only" as suggested above.

Answer:Answer:

either of ...

• quadrant 1 only

• quadrant 1 and 4 only

Step-by-step explanation:

Time since the storm started is always positive. The values of x are positive in quadrants 1 and 4.

Temperatures in a blizzard are not always terribly cold. Some of the coldest snowstorms on record have temperatures in the range of +5 °F to +18 °F. These values are negative temperatures on the Celsius scale, so the quadrant used for plotting them will depend on the temperature scale you choose.

While temperatures in Alaska can be well below zero (on either the F or C temperature scales), the air usually has to warm up to the range indicated above before it can snow. US temperatures are generally reported using the Fahrenheit scale, but weather records are often kept using the Celsius scale.

I would be inclined to choose "Quadrant 1 and 4 only", but arguments can be made for "1 only" and "4 only" as suggested above.

Step-by-step explanation:

Cos(75°)cos(15°) find the fraction solution

Answers

the answer in decimal form is .25 but in fraction form is 1/4

Final answer:

The value of cos(75°)cos(15°) is 0.25.

Explanation:

To solve the expression cos(75°)cos(15°), we use the identity cos(a)cos(b) = 0.5[cos(a+b) + cos(a-b)]. Applying this identity, we have:



cos(75°)cos(15°) = 0.5[cos(75°+15°) + cos(75°-15°)].



Using the values of cos(90°) = 0 and cos(60°) = 0.5, we can simplify the expression:



cos(75°)cos(15°) = 0.5[cos(90°) + cos(60°)] = 0.5[0 + 0.5] = 0.25.

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Measure of angle LOI= 38 degrees
Measure of angle JOP= 84 degrees
Find measure of angle JKP

Answers

Answer:

The measure of angle JKP is 61°

Step-by-step explanation:

we know that

If the measure of angle m<LOI=38°

then

m arc IL=38° -----> by central angle

and

If the measure of angle m<JOP=84°

then

m arc JP=84° -----> by central angle

Remember that

The measure of the interior angle is the semi-sum of the arcs that comprise it and its opposite.

so

m<JKP=(1/2)[arc IL+arc JP]

substitute the values

m<JKP=(1/2)[38°+84°]=61°

Which figure shows how a shape can be rotated about an axis to form a hemisphere?

Answers

Answer:

A. (first choice)

Step-by-step explanation:

Examine all options:

A. The diagram shows the arc (1/4 from a circle). While rotating this arc about the given axis, we get the hemisphere.

B. The diagram shows the semicircle (1/2 from a circle). While rotating this semicircle about the given axis, we get the whole sphere.

C. The diagram shows the segment (perpendicular to the axis). While rotating this segment about the given axis, we get the circle (lying in a plane).

D. The diagram shows the segment. While rotating this segment about the given axis, we get the cone.

For flights from a particular airport in January, there is a 30 percent chance of a flight being delayed because of icy weather. If a flight is delayed because of icy weather, there is a 10 percent chance the flight will also be delayed because of a mechanical problem. If a flight is not delayed because of icy weather, there is a 5 percent chance that it will be delayed because of a mechanical problem. If one flight is selected at random from the airport in January, what is the probability that the flight selected will have at least one of the two types of delays?

Answers

Answer:

0.335

Step-by-step explanation:

1. There is a 30 percent chance of a flight being delayed because of icy weather ,then the probability of being delayed is 0.3 and of being not delayed is 0.7.

2. If a flight is delayed because of icy weather, there is a 10 percent chance the flight will also be delayed because of a mechanical problem, then the probability of being delayed is 0.1 and the probabilty of not being delayed is 0.9.

3. If a flight is not delayed because of icy weather, there is a 5 percent chance that it will be delayed because of a mechanical problem (MP), then the probability of being delayed is 0.05 and the probabilty of not being delayed is 0.95. (See attached probability tree)

Delayed of icy weather - 0.3

Delayed of MP when weather is not icy - 0.7·0.05=0.035

Now, if one flight is selected at random from the airport in January, the probability that the flight selected will have at least one of the two types of delays is

0.3+0.035=0.335

The probability that the flight selected will have at least one of the two types of delays is  [tex]0.335[/tex].

1. There is a [tex]30[/tex]% chance of a flight being delayed because of icy weather, [tex]\therefore[/tex] probability of being delayed is  [tex]P(a)=0.3[/tex]  

probability of not being delayed is [tex]P(a')=1-0.3=0.7[/tex].

2. If a flight is delayed because of icy weather, there is [tex]10[/tex]% chance the flight will also be delayed because of a mechanical problem,

[tex]\therefore[/tex] probability of being delayed is [tex]P(b)=0.1[/tex]

probability of not being delayed is [tex]P(b')=1-0.1=0.9[/tex].

3. If a flight is not delayed because of icy weather, there is [tex]5[/tex]% chance that it will be delayed because of a mechanical problem ,

[tex]\therefore[/tex]probability of being delayed is [tex]P(c)=0.05[/tex]

probability of not being delayed is [tex]P(c')=1-0.05=0.95[/tex].

 

Delayed of mechanical problem when weather is not icy is:

[tex]P(a'\cap c)=P(a').P(c)=0.7\times 0.05=0.035[/tex]

Now, if one flight is selected at random from the airport in January, the probability that the flight selected will have at least one of the two types of delays is

[tex]P(a'\cap c)+P(a)=0.035+0.3=0.335[/tex]

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If one dollar bill is 0.0001 meters thick how many meters tall would a stack of 4 trillion one dollar bills be?

Answers

Answer:

400,000,000

Step-by-step explanation:

4000000000000×.0001 is the answer above

Answer:

[tex]4 \times {10}^{8 }m \: or \: 400,000,000m[/tex]

Step-by-step explanation:

Put them both into standard form.

[tex]0.0001 = 1 \times {10}^{ - 4} \: and \: 4 \: trillion \: is \: 4 \times {10}^{12} [/tex]

Multiply them together.

[tex](1 \times {10}^{ - 4} ) \times (4 \times {10}^{12}) = 4 \times 10^{8} [/tex]

Can someone please help me on this

Answers

Answer:

• The function is a linear function

• The function changes at a constant rate

Step-by-step explanation:

A graph of the function shows it to be a straight line (linear function). Such a function always changes at a constant rate. The line goes downward to the right, so the function is a decreasing function.

___

"changes at a constant rate" and "linear function" are two different ways of saying the same thing: the graph of the function is a straight line.

A standard deck of playing cards has 52 cards total that contains 13 of each suit (hearts, diamonds, clubs and spades). What is the probability that the card you draw will be RED?

Question 2 options:

A 1/52

B 1/13

C 1/2

D 1/4

Answers

Answer:

C 1/2

Step-by-step explanation:

There are 4 suits, 2 suits are  red (hearts and diamonds) while 2 are black (clubs and spades)

Since 13 cards are in each suit, 26 cards are red ( 2 * 13)  

There are 52 total cards

P (red) = red cards/ total cards

           = 26 / 52

           = 1/2

Suppose you graphed every single point of the form $(2t + 3, 3-3t)$. For example, when $t=2$, we have $2t + 3 = 7$ and $3-3t = -3$, so $(7,-3)$ is on the graph. Explain why the graph is a line, and find an equation whose graph is this line.

Answers

Answer:

see below for explanation

3x +2y = 15

Step-by-step explanation:

The x-coordinate and the y-coordinate are both linear functions of t, so their relationship to each other is linear. A graph of those (x, y) points must be a line.

___

You can find an equation by solving one of the expressions for t, then substituting that into the other.

x = 2t +3

t = (x -3)/2

Substituting into the y expression, we get ...

y = 3 -3(x -3)/2

y = (-3/2)x + 15/2

3x +2y = 15 . . . . . . . add 3/2x and multiply by 2 to put into standard form

_____

The attached graph shows a portion of the line defined parametrically (0 ≤ t ≤ 1). It is dotted so you can see it overlays the line defined by the linear equation in x and y.

Dalia has 9 hamsters and 4 fish at her house. Choose the ratio of fish to the total number of pets. (Select all that apply.)

A) 4 to 9
B) 4 to 13
C) 9 to 13
D) 4:9
E) 4:13
F) 13:4

Answers

Answer:

4 to 13

4:13

Step-by-step explanation:

I finished my test and these were the answers

Final answer:

The ratio of the number of fish to the total number of pets Dalia has is 4 to 13 or 4:13.

Explanation:

The subject of this question is the calculation of a ratio. In this case, the asked ratio is the number of fish to the total number of pets that Dalia has. Dalia has 4 fish and a total of 9 hamsters + 4 fish = 13 pets. Therefore, the correct answer is the ratio of 4 (fish) to 13 (total pets). This ratio can be represented in two ways: B) 4 to 13 or E) 4:13. The other options represent different ratios and do not correctly answer the question.

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Which of the following quadratic functions are in standard form?
(Picture attached)

Answers

E and F

The standard form for a quadratic function is f(x) = ax^2 + bx + c.

E follows this pattern. a = -2; b = -8; c = 3

F also follows this pattern. a = 1/2; b = -2; c = 0

Please help!! 30 points!! Will mark brainliest!!

Answers

Answer:

x = ab/c

Step-by-step explanation:

The product of the distances from the point of intersection of the chords (secants) to the circle is the same for both chords (secants). (This is true whether the point of intersection is inside or outside the circle.)

ab = cx

x = ab/c

Please help: What is the inverse of the function below?

Answers

Answer:

  D. [tex]f^{-1}(x)=\log_2{(x-6)}[/tex]

Step-by-step explanation:

Solve x = f(y) for y:

  x = 2^y +6

  x -6 = 2^y . . . . subtract 6

  log2(x -6) = y . . . . take the log base 2 . . . . matches choice D

Answer:

The answer is D

Step-by-step explanation:

In order to find out the inverse of the function, you have to express a new function where the independent variable must be "y" instead of "x".

So, you have to reorganize the base function and then free the variable "x".

[tex]f(x)=2^x+6\\f(x)=y\\y=2^x+6\\2^x=y-6\\log_2(2^x)=log_2(y-6)\\x*log_2(2)=log_2(y-6)\\log_2(2)=1\\x=log_2(y-6)\\[/tex]

Then, we recall "y" as "x" and [tex]x=f^-^1(x)[/tex]

Finally, the answer is:

[tex]f^-^1(x)=log_2(x-6)[/tex]

solve the equation n+5=2n-1

Answers

n+5=2n-1

5=n-1

6=n <— Answer

Can someone please help me with this problem

Answers

Answer:

  745.5 ft

Step-by-step explanation:

The mnemonic SOH CAH TOA reminds you of the trig function relating the hypotenuse and the side opposite an angle. It tells you ...

  Sin = Opposite/Hypotenuse

The line marked x (the hypotenuse of the triangle) is a transversal crossing the two parallel horizontal lines. That means the interior angle of the triangle at lower right (the angle of elevation) has the measure 28°. That angle is opposite the side marked 350 ft. So, you have ...

  sin(28°) = (350 ft)/x

Multiplying by x/sin(28°), this equation becomes ...

  x = 350 ft/sin(28°)

  x ≈ 745.5 ft

I need the answer ASAP!!!
A study of homeowners in the 5th congressional district in Maryland found that their annual
household incomes are normally distributed with a mean of $41,182 and a standard deviation of $11,990
(based on data from Nielsen Media Research).


What percentage of household incomes are between $25,000 and $40,000?

A. 53.93%
B. 62.5%
C. 28.23%
D. 37.22%

Answers

Answer:

  D.  37.22%

Step-by-step explanation:

One of my favorite probability z-table websites calculates the fraction as 0.3722 = 37.22%.

___

Your graphing calculator or spreadsheet can probably do the same for you.

Final answer:

Using the concepts of the normal distribution and z-scores, you calculate the z-scores for $25,000 and $40,000. Then, looking up these z-scores in a standard normal distribution table, and subtracting these, you get the percentage 37.17%, making the closest answer option D: 37.22%.

Explanation:

This question requires understanding of both normal distribution and z-scores. A Z-score measures how many standard deviations an element is from the mean. To solve this, we calculate the z-scores for $25,000 and $40,000, respectively, using the formula: z = (X - μ) / σ where X is the value, μ is the mean, and σ is the standard deviation.

For $25,000, Z1 = ($25,000 - $41,182) / $11,990 = -1.35 For $40,000, Z2 = ($40,000 - $41,182) / $11,990 = -0.10

Then, look up these z-scores in a standard normal distribution table (also known as a Z table). The values corresponding to -1.35 and -0.10 are 0.0885 and 0.4602, respectively. Substract these to find the percentage of homeowners with incomes between $25,000 and $40,000. That is, (0.4602 - 0.0885) * 100 = 37.17%. The closest answer is then option D: 37.22%

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PLEASE HELP ASAP, I WILL MAKE U BRAINLIEST

The graph shows the normal distribution of the length of similar components produced by a company with a mean of 5 centimeters and a standard deviation of 0.02 centimeters. If a component is chosen at random, the probability that the length of this component is between 4.98 centimeters and 5.02 centimeters is about __%, and the probability that the length of this component is between 5.02 centimeters and 5.04 centimeters is about __%.

Answers

Answer:

1. P(A) = 0.6826

2. P(B) = 0.13591

Step-by-step explanation:

the first graph is given just as an example to show the percentage distribution values for bell shaped curve

Answer:

68.3%, 33.3%

Step-by-step explanation:

PLATO answer!! pls mark brainliest :)))

A cricular arena is lit by 5 lights equally spaced around the perimeter of the arena. What is the measure of each angle formed by the lights on the perimeter?

Answers

Answer:

108°

Step-by-step explanation:

Suppose that circle with center A is a circular arena. Points B, C, D, E and F are 5 lights. These 5 points form regular pentagon (because these 5 lights are equally spaced around the perimeter of the arena).

The sum of all interior angles of pentagon can be calculated using following formula

[tex](n-2)\cdot 180^{\circ},\\ \\(5-2)\cdot 180^{\circ}=3\cdot 180^{\circ}=540^{\circ}[/tex]

All interior angles in regular pentagon are of equal measure, so

[tex]\dfrac{540^{\circ}}{5}=108^{\circ}[/tex]

Thus, the measure of each angle formed by the lights on the perimeter is 108°.

Answer:

D. 108

Step-by-step explanation:

I just did the test yourself

Find the perimeter of a triangle with sides measuring 5 centimeters , 9 centimeter, and 11 centimeters

Answers

Perimeter is the distance around an object, so you would add 5+9+11 to get 25 cm

If 2n + 3(2- 2n) = 14 what is the value of n? (Please give the correct answer, I will give brainliest)

Answers

Answer:

  n = -2

Step-by-step explanation:

Eliminating parentheses, you have ...

  2n +6 -6n = 14

Combining terms and subtracting 6, you get ...

  -4n = 8

Dividing by the coefficient of n gives ...

  n = -2

_____

Check

  2(-2) +3(2 -2(-2)) = 14

  -4 +3(2+4) = 14

  -4 +3(6) = 14

  -4 +18 = 14 . . . . answer checks OK

A mother who is 40 years old has a daughter and a son. The son is twice as old as the daugther. In 15 years the sum of all their ages will be 100 years. How old are the siblings now?

Answers

Answer:

Step-by-step explanation:

Let's call the ages D for daughter and S for son.

We know that the son is twice as old as the daughter, so:

S = 2D

We also know that in 15 years, their ages add up to 100, so:

(40+15) + (S+15) + (D+15) = 100

55 + S + 15 + D + 15 = 100

85 + S + D = 100

S + D = 15

Substituting the first equation:

2D + D = 15

3D = 15

D = 5

Therefore:

S = 2D = 10

The son is 10 and the daughter is 5.

Answer:

son = 10

daughter  = 5

Step-by-step explanation:

Let the daughter = d

Let the son =          s

s = 2*d

there ages in 15 years

Mother = 40 + 15 = 55

Son = s + 15

daughter = d + 15

Total: s + 15 + d+15 + 55 = 100    Combine the like terms.

s + d + 85 = 100                            Subtract 85 from both sides.

s + d = 100 - 85

s + d = 15

s = 2*d                                            Substitute for son

2d + d = 15

3d = 15

d = 15/3

d = 5

son = 2*5

son = 10

Check

son = 15 =           25

daughter + 15 =  20

Mother + 15    =   55

Total                   100 just as it should be.

Which statement is true regarding the graphed functions?

Answers

ANSWER

[tex]f(0) = g(0)[/tex]

EXPLANATION

From the graph we

[tex]g(0) = - 2[/tex]

because this is where the line x= 0 meets the graph of g(x).

Also

[tex]f(0) = - 2[/tex]

because this is where the line x= 0 meets the graph of f(x).

This implies that,

[tex]f(0) = g(0)[/tex]

The correct choice is A.

find the area of the yellow region round to the nearest tenth
Please help! For my little sister

Answers

Answer:

So first, we need to find the area of the whole circle since we already had the radius:

A = πr² = 3.14 . 7.53² = 178.040826 (cm²)

Now our next job is to find the area of the square inside the circle.

Looking at the picture, we can see that the radius of the circle is also half of the diagonal of the square, so the whole diagonal of the square should be: 7.53 . 2 = 15.06 (cm)

*Now this is where things get a little bit more complicated:

Imagine that x is the length of the side of the square.

Using Pythagorean theorem, knowing that d is the diagonal of the square and also the hypotenuse of the right triangle inside the square, we have the equation:

a² + a² = d²

2a²      = d²

a²        = d²/2

a²        = 226.8036/2 = 113.4018

So a², which is also the area of the square, is 113.4018 (cm²)

So the are of the yellow region is: 178.040826 - 113.4018 ≈ 64.6 (cm²)

*I could be wrong though

Preston wants to create a garden that backs up to an existing fence in his yard. He won't need to enclose the garden with fencing and he only has 85 feet of fencing available. What was the largest dimensions of the garden be if you could encloses the three sides of the garden and use the existing fence as the fourth side? If necessary, round answer to the nearest tenth.

Answers

Answer:

  42.5 ft by 21.3 ft

Step-by-step explanation:

The largest area is obtained when half the available fence is used parallel to the existing fence, and the other half is used to fence the two ends of the rectangle. Here, that means the dimension parallel to the existing fence is ...

  (85 ft)/2 = 42.5 ft

and the ends of the rectangular garden are ...

  (42.5 ft)/2 = 21.25 ft ≈ 21.3 ft

_____

You can figure this as follows:

Let x represent the length of fence parallel to the existing fence. Then the other dimension of the fenced area is (85 -x)/2 and the fenced area is the product of these dimensions.

  area = x(85-x)/2

This expression describes a downward-opening parabola with zeros at x=0 and at x=85. The vertex (maximum) will be found where x is halfway between these values, at x = (0 +85)/2 = 42.5.

Area is maximized when 42.5 ft of fencing is used parallel to the existing fence, and the other half of the fencing is used for the other two sides of the enclosure.

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