Solve.From a 40-inch by 40-inch piece of metal, squares are cut out of the four corners so that the sides can then be folded up to make a box. Let x represent the length of the sides of the squares, in inches, that are cut out. Express the volume of the box as a function of x. Give the function and state its domain.
A. V = 4x3 - 160x2 + 1600x: x < 40
B. V = 4x3 - 160x2 + 1600x: 0 < x < 20
C. V = 2x3 - 120x2 + 40x: 0 < x < 20
D. V = 2x3 - 120x2 + 1600x: x >0
Answer: B
Mathematics
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