Carol H. answered 07/21/18
Tutor
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Masters' Degree in Mathematics with 35 Years of Teaching Experience
m∠A + m∠B + m∠C = 180
40x - 27 + 25 - 2x + 26 + x = 180
39x = 156
x = 4
m∠A = 133º, m∠B = 17º, m∠C = 30º