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A cardboard box used for flat rate shipping by a postal service has length 18 inches, width 14 inches, and height 7 inches. Complete parts a through d below.
a. The volume of a rectangular box is the product of the length times the width times the height. Determine the volume of the box.
The volume of the box is 1764 cubic inches.
(Simplify your answer.)
b. Suppose each dimension is increased by $x$ inches. Represent the length, width, and height of the new box symbolically in terms of $x$.
The length of the new box in terms of $x$ is $18+x$.
The width of the new box in terms of x is $\square$.