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A rectangular box is to have a square base and a volume of 81 ft 3 . If the material for the base costs $0.54/ft
A rectangular box is to have a square base and a volume of 81 ft3. If the material for the base costs $0.54/ft2, the material for the sides costs $0.12/ft2, and the material for the top costs $0.18/ft2, determine the dimensions (in ft) of the box that can be constructed at minimum cost. find x and y in feet
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