Question

brody's farm borders a river. He buys 1,000 meters of fencing. What dimensions maximize the area of the farm?

Answer 1

First write what you need to find
A = LW
Then what you know (since it is against a river you only need three sides hence the one W)
P = 2L + W
1000 = 2L + W
Solve for one variable (I chose W)
W = 1000 - 2L
Plug into Area equation
A = 1000L - 2L^2
Take the derivative
dA/dL = 1000 - 4L
Solve for L
L=250
Plug into perimeter equation
1000 = 2(250) + W
W = 500
Therefore the dimensions should be 250 m x 500 m given that it is against the river.

Answer 2

you got this answer from yahoo

Answer 3

no I figure it out by myself did I get it right or not