Ok... In order to do question #2 you have to use the formula to find volume of a cube, which is V= a^3 ( a stands for edge length). From what the problem mentions, the volume must be 1.5^3= 3.38 cubic feet. The next and final approach to the problem is how much will it cost to fill the pot. So if 1 or per cubic foot is $4 then 3.38 cubic foot will be 3.38 times 4 which is $13.58. Hope it helped you.
