Nathan B. answered 05/23/18
Tutor
5
(20)
Elementary and Algebraic skilled
Supplementary angles are angles that add up to 180°. That means we have:
39 + ____ = 180
So to solve this, we need to subtract 39 from both sides to isolate the unknown:
39 - 39 + ____ = 180 - 39
180 - 39 = ____
Solve that problem, and you'll have your answer.