An open box with a square base is required to have a volume of 10 cubic feet.

NOTE: What exactly is a cubic foot?

(a) Express the amount A of material used to make such a box as a function of the length x of a side of the square base.

(b) How much material is required for a base 1 foot by 1 foot?

NOTE: Is one foot by foot the same as 144 inches?