For the first question part a. The volume of a round cake pan is V=πr^2h or 76.97. The volume of the rectangle pan is V=whl or 108. The rectangular pan has a larger volume.
For part b of the second question, for the rectangular cake you do. A=2(hl+hw)+wl or 114. For the circular cake it is 2πrh+2πr2-38.48 or 82.47.
The second question you asked is easy. The answer is 3, 4, 7, 9, 10, 11, 13