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Question 886052: Minimum Cost: A rectangular area adjacent to a river is to be fenced in; no fence is needed on the river side. The enclosed area is to be 1,000 square feet. Fencing for the side parallel to the river is $5 per linear foot, and fencing for the other two sides is $8 per linear foot; the four corner posts are $25 apiece. Let x be the length of one of the sides perpendicular to the river.

a) Write a function C(x) that describes the cost of the project.
b) What is the domain of C?

I don't know exactly how to do this. Any suggestions on what I mess up on is greatly appreciated.

4 * 25 = 100 NOT A VARIABLE COST
5y * 8x = 1,000 I put it like this because it is a rectangle and I was trying to get the area. So I multiplied l * w.
5y * 8x - 5y = 1,000 - 5y
8x = -5y + 1,000
8x - 1,000 = -5y + 1,000 - 1,000
8x - 1,000 = -5y
8x - 1,000 / -5 = -5y / -5
-8/5x - 200
C(x) = - 8/5x - 200
I was told it was wrong. I've also tried the following.
8x^2 + 5 y + 100 = 1000
8x^2 5y + 100 - 100 = 1000 - 100
8x^2 + 5y = 900
8x^2 + 5y - 8x^2 = -8x^2 + 900
5y = -8x^2 + 900
5y / 5 = -8x2 + 900 / 5
y = -8/5x^2 +180

8x + 8x + 5y + 100 = 1000
16x + 5y + 100 = 1000
16x + 5y + 100 - 100 = 1000 - 100
16x + 5y = 900
16x + 5y - 16x = -16x + 900
5y = -16x + 900
5y / 5 = -16x + 900 / 5
y = -16/5x + 180
I'm not sure how to explain the cost of the project or to find the domain either.

Thank you in advance. Chastity Moore
Click here to see answer by Theo(13342)

Question 886089: 4 yards = how many feet

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Question 886125: The height of a room is 7 feet the width is 10 feet the volume is 240 what is the length?

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Question 886240: Find the area of the walkway (24 inches wide) that will be installed around a circular jacuzzi with diameter of 6 feet.
Click here to see answer by JulietG(1812)

Question 886194: A basketball player scored a total of 19 points for making 7 baskets. He made 3 and 2 points only. How many of each type of of shots did he make?
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Question 886274: Help with this problem, please.
The number of first -year enrollment in obsteopathy schools during the period from 1990 through 1996, can be approximated by the polynomial funcation defined by f(x)=0.5x^2+68.9x+1852, where x=0 corresponds to 1990, x=1 corresponds to 1991, and so on. Based on this model, how many first -year students were there in 1993?
Click here to see answer by jim_thompson5910(35256)

Question 886386: The area of a rectangle is 42 ft. squared, , and the length of the rectangle is 11 ft. less than three times the width. Find the dimensions of the rectangle:
Length: ft.
Width: ft.
PLEASE HELP!
THANK YOU :)
Click here to see answer by stanbon(75887)

Question 886354: A square hall has a rug and an uncarpeted area of tile floor bordering it that is 2 feet on each side. What is the size of the carpet if the carpeted area is 152 square feet.
Click here to see answer by josmiceli(19441)

Question 886533: Two ships are sailing a direct course into harbor. Ship A is 22 miles from harbor. Ship B is sailing into harbor on a course perpendicular to that of ship A. If the angle between them is 47 degrees, how far is ship B from the harbor? Round the answer to the nearest tenth.
Click here to see answer by ankor@dixie-net.com(22740)

Question 886560: if length of field is twice its width,then its area is equal to its perimeter if
1) its width is zero
2) its width is 3
3) its length is three
4) its width is 6
5) its length is 6
Click here to see answer by josgarithmetic(39617)

Question 886814: Please help me solve this problem: A ball is projected upward from ground level. After t seconds, its height in feet is a function defined by f(t)=-16t^2 + 96t. After how many seconds will it reach a height of 128 feet?
Click here to see answer by Alan3354(69443)

Question 886813: Please help me solve this problem: If an object is projected upward with an initial velocity of 112 feet per second from a height h of 128 feet, then its height t sec after it is projected is defined by the equation h=-16t^2+112t+128. How many sec after it is projected will it hit the ground?
Click here to see answer by richwmiller(17219)

Question 886812: Please help me solve this problem: A box with no top is to be constructed from a piece of cardboard whose width measures x cm and whose length measures 6 cm more than its width. The box is to be formed by cutting squares that measure 2 cm on each side from the four corners, and then folding up the sides. If the volume of the box will be 182 cm^3, what are the dimensions of the piece of cardboard?
Click here to see answer by josmiceli(19441)

Question 886942: write a program to find wheather the area of the rectangle is greathe then its perimeter
Click here to see answer by josgarithmetic(39617)

Question 886942: write a program to find wheather the area of the rectangle is greathe then its perimeter
Click here to see answer by Alan3354(69443)

Question 886945: How many cubes with 5inches sides will completely fill a cube that is 10 inches on one side?
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Question 886945: How many cubes with 5inches sides will completely fill a cube that is 10 inches on one side?
Click here to see answer by rothauserc(4718)

Question 887031: The Smiths are considering getting hardwood floors in their living room. The room is rectangular with dimensions 25 feet by 32 feet. If hardwood floors cost $12.25 per square foot, how much will it cost the Smiths to have their living room covered.
Click here to see answer by Alan3354(69443)

Question 887123:
The figures are similar. The area of one figure is given. Find the area of the other figure to the nearest whole number.

The area of the larger triangle is 606 ft2.
Click here to see answer by Alan3354(69443)

Question 887180: Two gardens are being fenced in. Both gardens will require the same amount of fencing (both gardens have the same perimeter in meters). One garden is the shape of a square and the other is in the shape of an equilateral triangle. Each side of the triangle is 7 meters longer than each side of the square. Find the dimensions of the gardens?
Click here to see answer by josgarithmetic(39617)

Question 887215: If area of square is equal to area of circle, then what will be the ratio of their perimeter???
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Question 887224: the ratio of length of a school ground ti its width is 5:2 find the length if width is 40 meters
Click here to see answer by stanbon(75887)

Question 887310: Please help me solve this: A ball is projected upward from ground level. After t seconds, its height in feet is a function defined by f(t)= -16t^2 + 96t. After how many seconds will it reach a height of 128 feet?
Click here to see answer by Alan3354(69443)

Question 887309: Please help me solve this: If an object is projected upward with an initial velocity of 112 feet per second from a height of 128 feet, then its height t seconds after it is projected is defined by the equation h= -16t^2 + 112t + 128. How many seconds after it is projected will it hit the ground?
Click here to see answer by Alan3354(69443)

Question 887311: Please help me solve this: A box with no top is to be constructed from a piece of cardboard whose width measures x cm and whose length measures 6 cm more than its width. The box is to be formed by cutting squares that measure 2 cm on each side from the 4 corners, and then folding up the sides. If the volume of the box will be 182 cm^3, what are the dimensions of the piece of cardboard?
Click here to see answer by josgarithmetic(39617)

Question 887408: how to convert feet to millimeters?
Click here to see answer by Edwin McCravy(20054)

Question 887494: The perimeter of a rectangle is 110 feet. The ratio of the width to the length is 4:7. Find the length and the width.
Click here to see answer by rfer(16322)

Question 887467: The dimensions of a rectangular mural on the wall of Amy's bedroom are 2 feet by 3 feet. What is the area of the mural?
Click here to see answer by Alan3354(69443)

Question 887561: a retangler garden has a length that is nine less than three times its width. if the perimeter is 89 feet, what are the dimensions.
Click here to see answer by 2897696(96)

Question 887561: a retangler garden has a length that is nine less than three times its width. if the perimeter is 89 feet, what are the dimensions.
Click here to see answer by stanbon(75887)

Question 887750: The length of a rectangle is seven feet more than its width if the perimete is 18 feet what are its dimensions
Click here to see answer by josgarithmetic(39617)

Question 887740: If it takes a football player 8 seconds to run the width and 15 seconds to run the lenght of the pitch.
How long does it take to run from one corner to adjacent or opposite corner?
Click here to see answer by dadjosm(1)

Question 887877: The length of one leg of a right triangle is 7 centimeters more than that of the other leg. the length of the hypotenuse is 3 centimeters more than double that of the shorter leg. find the length of each of the three sides of the three sides.
x+7
2x+3
x
Click here to see answer by 2897696(96)

Question 887898: School has at least 244 students. There are 4 more girls than twice the number of boys. What is the minimum of girls in the school
Click here to see answer by Edwin McCravy(20054)

Question 887911: An artist intends to paint a 60 square foot mural on large wall as shown in the illustration. Find the dimensions of the mural if the artist leaves a border of uniform width around it.
Click here to see answer by Alan3354(69443)

Question 887432: If the price is $5 per square foot, how much would a 4 X 8 banner be?
Click here to see answer by dv2016(7)

Question 888081: I don't know where to start with this word problem. Can you help me?
For every 4 fish pond Jasmine must five plants. What is the maximum number of fish she can have if she has 75 plants?
Click here to see answer by ankor@dixie-net.com(22740)

Question 888119: Find the volume of the metal used in a hollow cylinder open at both ends whose external diameter is 28 cm, thickness 3.5 cm and height 10 cm.
Click here to see answer by lwsshak3(11628)

Question 888030: The area of a rectangle is 352 square inches. The measure of each of the shorter sides equals the perimeter of a square with 4-inch sides. What is the measure of each of the longer sides of the rectangle?
Click here to see answer by KMST(5328)

Question 888154: If each pupil must be allowed 10m cube of air, how many pupils can be put in a room 10 m long , 8 m wide and 6 m height?
Click here to see answer by Alan3354(69443)

Question 888150: If each pupil must be allowed 10m cube of air, how many pupils can be put in a room 10 m long , 8 m wide and 6 m height?
Click here to see answer by Alan3354(69443)

Question 888181: f Joe stands 25 feet away from a 40 ft tall building, how long would a ladder have to be to reach from the ground where Joe is standing to the top of the building? (Round to the nearest hundredth)
Click here to see answer by stanbon(75887)

Question 888234: Not sure about number 1 and stuck on number 2 & 3. Can you help me with these?
1. A race car can travel 2 laps in 5 minutes. At this rate how long will it take him to travel 75 laps?
2. The ratio of apples to oranges in fruit bowl is 1 to 4. If there are 5 apples in the bowl how many oranges are there?
3. Which car is traveling faster? Car 1: 300 miles in 5 hours Car 2: 250 miles in 4 hours

Click here to see answer by josgarithmetic(39617)

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