The dimensions of a rectangular prism are shown below. Length: 2 1/4 feet, Width: 1 foot, Height: 1 1/4 feet. The lengths of the sides of a small cube are 1/4 foot each. Part A: how many small cubes can be packed in the rectangular prism? Show your work. (5 points) Part B: use the answer obtained in Part A to find the volume of the rectangular prism in terms of the small cube and a unit cube. (5 points)