An open box is to be made from a square piece of cardboard, 72 inches on a side, by cutting equal squares with sides of length x from the corners and turning up the sides (see figure below) .After determining the function V, in terms of x, that represents the volume of the box, use a graphing utility to estimate the dimensions that will maximize its volume.

A)
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× 
B)
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C)
×
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D)
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E)
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Correct Answer:
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