Extracted text: Compute the combined moment of the two 80-Ib forces about (a) point O and (b) point A. The moment is positive if counterclockwise, negative if clockwise. Assume a = 4.9 in, b= 29 in, F= 80 lb. F A F Answers: (a) Mo = i Ib-in. (b) MA = i Ib-in.