Find the sum of the geometric series:
32 - 8 + 2 - 1/2 +

Time to work it out 
32 - 8 + 2 - 1/2
32 - 8 + 2 = 26
now you have
-1/2 + 26 
so we convert 26 to fraction form to subtract 
26/1 - 1/2
we must find the common denominator
52/2 - 1/2
51/2
fifty-one over 2 (fraction) is your answer! :)

Yes of course i will indeed you with your problem.

2160ft^3 i think you could use a formala to you out with this in the future