Given this information, angles 2, 3, and 4 are already right angles. That leaves angle 5 and angle 1 to be complementary with each other, as they form a right angle.
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75+5m=50+7.5m -50 from both sides 25+5m=7.5m -5m from both sides 25=2.5m divide both sides by 2.5 10=m for 10therefor 75+5m<50+7.5m he must sell 11 memberships.