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Mathematics 10 Online
OpenStudy (anonymous):

A rectangular box is to have a square base and a volume of 80 ft3. The material for the base costs 45¢/ft2, the material for the sides costs 10¢/ft2, and the material for the top costs 32¢/ft2. Letting x denote the length of one side of the base, find a function in the variable x giving the cost (in dollars) of constructing the box. f(x)=

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