The sum of three times an angle and twice its complement is 215. What are the measures of the angles? x = the angle 90  x = its complement {complementary angles add up to 90°} 3x + 2(90  x) = 215 {sum of three times the angle and its complement is 215} 3x + 180  2x = 215 {used distributive property} x + 180 = 215 {combined like terms} x = 35 {subtracted 180 from each side} 90  x = 55 {substituted 35, in for x, into 90  x} the angle is 35° its complement is 55°  Algebra House
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