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a tray with a square base is to be made from a square piece of cardboard by cutting 5 inch squares from each corner and folding up the sides. If the box is to hold a volume 520 cubic inches, find the length of the piece of cardboard that is needed.

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520/5 = 104 sq inches for base

Area of cardboard = 105 + 4(5^2)

Length = √area

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