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For Problems 4.10 to 4.22, design rectangular sections for the beams, loads, and p values shown. Beam weights are not included in the loads shown. Show sketches of cross sections, including bar sizes, arrangement, and spacing. Assume concrete weighs 150 lb/ft, f, = 60,000 psi, and f' = 4000 psi, unless given otherwise. Problem 4.10 PL = 30k wp = 3 k/ft -10 ft 10 ft -20 ft Use pa po