SOLUTION: Find m∠ 4 if m∠ B=137c and ∠ 4 and ∠ b are supplementary.

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Question 697100: Find m∠ 4 if m∠ B=137c and ∠ 4 and ∠ b are supplementary.
Answer by MathLover1(20849) About Me  (Show Source):
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Supplementary angles are pairs of angles that add up to 180 degrees.
m ∠ 4+b=180........b=137
m ∠ 4=180-137
m ∠ 4=43 degrees