A cardboard box with no top and a square base is being constructed and must have a

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A cardboard box with no top and a square base is being constructed and must have a volume of 108 cubic inches. Let x be the length of a side of its base in inches. 

(a) Write a formula A (x) that calculates the outside surface area in square feet of the box. 

(b) If cardboard costs $0.10 per square foot, write a formula C (x) that gives the cost in dollars of the cardboard in the box. 

(c) Find the dimensions of the box that would minimize the cost of the cardboard.

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