pre calc
posted by manny .
The length of a rectangle is three times its width.
If the area of the rectangle is 45 ayrds squared , find its perimeter.

L=3W
45=LW=3w^2
w=sqrt15
Perimeter=2(L+W)=2(4W) and you can finish it.
This is hardly close to calculus, more like beginning geometry.
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