algebra
posted by mich .
Volume of a Box (Refer to the preceding exercise.)
A box is constructed from a square piece of metal that
is 20 inches on a side.
(a) If the square corners of length x are cut out, write
a polynomial that gives the volume of the box.
(b) Evaluate the polynomial when inches.
(c) Factor out the greatest common factor for this
polynomial expression.

what shape is the box? Is it a square box, of height x? Or is it a cube? Does it have a lid, or is it open?