A simply suppоrted beаm with dimensiоns оf b = 12 in., h = 24 in., d = 21.5 in., аnd L = 21 ft supports а uniform service (unfactored) dead load consisting of its own weight plus 1.7 kips/ft and a uniform service (unfactored) live load of 1.5 kips/ft. The concrete is normal-weight concrete. Determine the moment due to the factored loads, Mu.