012 (part 1 of 4) 10.0 points An open box is to be made from a rectangular piece of material 2 ft by 9 ft by cutting equal squares from each corner and turning up the sides. a) What size square must be cut out to have a maximum volume? Answer in units of ft. 013 (part 2 of 4) 10.0 points b) What is the width of the box? Answer in units of ft. 014 (part 3 of 4) 10.0 points c) What is the length of the box? Answer in units of ft.015 (part 4 of 4) 10.0 points d) What is the maximum volume? Answer in units of ft3