Part 2 of 2 Points: 0 of 1 Save a. Squares with sides of length x are cut out of each corner of a rectangular piece of cardboard measuring 7 ft by 5 ft. The resulting piece of cardboard is then folded into a box without a lid. Find the volume of the largest box that can be formed in this way. b. Suppose that in part (a) the original piece of cardboard is a square with sides of length s. Find the volume of the largest box that can be formed in this way. a. The maximum volume of the box is approximately 15.02 ft. (Round to the nearest hundredth as needed.) b. The maximum volume of the box is (Type an expression using s as the variable.)