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1. A rectangular box has a square base, four sides, but no top. It has a volume of 20 cubic feet.

Let A be the surface area of the box, and L the length of one side of the base.

(a) The volume is measured in cubic feet. What units are convenient to use for the area A
and the side length L?
(b) Is A a function of L? If no, explain why not. If yes, �nd the formula of A in terms of L
and point out its domain.

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