Congruent Squares of length x are cut from the corners of a 10 inch by 15 inch piece of cardboard to create a box without a lid. Write an expression in terms of x for each, the height of the box, the length of the box, the width of the box

When the corner squares are cut out, the sides can be folded up. When they are folded up, the height of the box is x.

After folding the sides, the length and width of the box each become 2x shorter.

So the length and width are (10-2x) and (15-2x).