If a man is wallpapering a room 9ft by 9ft by 9ft high. how many square feet of paper will he need if there are 93ft^2 of openings in the room? how do i solve for the answer

Assume that only the four 9 ft by 9 ft walls are to be papered.  Each wall will require (9 ft)^2 sq ft of paper, or 81 sq ft of paper.  Multiply that by 4 (since there are four walls):  324 sq ft.  Now subtract 93 sq ft from 324 sq ft to obtain the answer to this problem.