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Please answer 7.12 A built-up steel member is composed of a W18 X 71 wide- flange section with a 12-in.-by-2-in. plate welded to its top

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7.12 A built-up steel member is composed of a W18 X 71 wide- flange section with a 12-in.-by-2-in. plate welded to its top flange, as shown. Locate the X-X centroidal axis. 12" Cover plate 12" X W18 X 71 X X Sym

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