College Math
posted by Carol .
LPG is stored in highly insulated spherical vessels in most oil refineries. If the inside diameter of one of these tanks is 11.4 ft, find it's volume. Report your answer to the nearest onetenth of a gal. Use pie3014, and 1cubic ft= 705 gal. Possible
answers to choose from are: (A) 5815.1 gal, (B) 48968.9 gal, (C) 12,242.2, (D) 726.9 gal. HELP! I don't understand this.

v = pi/6 d^3 = 775.73ft^3
at 7.48gal/ft^3, that's 5802.5 gal
Using your approximations, I'd say that (A) is the right answer. Plug 'em in to make sure.