A medium-sized shipping box with side length s units has volume of s^3 cubic units. a. A large shipping box has side lengths that are 3 units longer than the medium box. Write a binomial expression for the volume of the large box. b. Expand the polynomial in part a to simplify the volume of the large shipping box. c. A small shipping box has side lengths that are 2 units shorter than the medium box. Write a binomial expression for the volume of the small shipping box.