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For the following exercises, construct a rational
85. A rectangular box with a square base is to have avolume of 20 cubic feet. The material for the basecosts 30 cents/square foot. The material for the sidescosts 10 cents/square foot. The material for the topcosts 20 cents/square foot. Determine the dimensionsthat will yield minimum cost. Let x= length of theside of the base.
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