Posted by **Liz** on Tuesday, October 25, 2011 at 7:32pm.

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You have 92 feet of fencing to enclose a rectangular plot that borders on a river. If you do not fence the side alongthe river, find the length and width of the plot that will maximize the area.

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**Steve**, Wednesday, October 26, 2011 at 5:20am
If length along river is y, and width =x,

2x+y = 92

a = xy = x(92-2x)

This is a parabola with roots 0,46.

So, maximum value is reached at x=23.

So, the pen is 23x46

- Math -
**Anonymous**, Thursday, April 12, 2012 at 11:44pm
sam can paddle a canoe 30km upstream in 5 hours. the return ship takes 3 hours. find the speed of canoe in still water

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