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posted by Anonymous Monday, September 13, 2010 at 3:48pm.
B is the midpoint of line AC. If AB = 12x-5 and BC = 4x + 15. Find x and BC.
since B is the midpoint of line AC, that means AB=BC set AB=BC 12x-5=4x+15 find x. plug x into 4x+15 to find BC.
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