Question: A rectangular box is to have a square base and a volume of 40 ft3. The material for the base costs 45/ft2, the material for

A rectangular box is to have a square base and a volume of 40 ft3. The material for the base costs 45/ft2, the material for the sides costs 10/ft2, and the material for the top costs 20/ft2. Let x denote the length of one side of the base. Top of the Box

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