SOLUTION: Beth has 4500 feet of fencing available to enclose a rectangular field. One side of the field lies along a river, so only three sides require fencing. Express the area A of the rec

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Question 337773: Beth has 4500 feet of fencing available to enclose a rectangular field. One side of the field lies along a river, so only three sides require fencing. Express the area A of the rectangle as a function of x, where x is the length of the side parallel to the river.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
P=W%2Bx%2BW=2W%2Bx=4500
From that,
2W=4500-x
W=%284500-x%29%2F2
The area of a rectangle is,
A=W%2Ax
A=%28%284500-x%29x%29%2F2