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Old 07-27-2007   #4
j y
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well because of what it tells you, you knowAC - AB = BC7x - 5 - 3x = BC4x - 5 = BCand you know. AB = BC because a midpoint divides a line in 23x = 4x - 55 = xthen you plug it into BCBC = 4x - 5BC = 20 - 5BC = 15