A Rectangular Box Is to Have a Square Base and a Volume

question 157

Multiple Choice

A rectangular box is to have a square base and a volume of 20 ft³. The material for the base costs , the material for the sides costs , and the material for the top costs . Letting x denote the length of one side of the base, find a function in the variable x giving the cost of constructing the box. ​ ​

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Definitions:

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