Squares with sides of length x are cut out of each corner of a rectangular piece of cardboard measuring 4 ft by 3 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.