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Soloha48 [4]
3 years ago
12

Please help

Mathematics
2 answers:
CaHeK987 [17]3 years ago
7 0

Answer:

  • A. 50

Step-by-step explanation:

B and C are supplementary angles as adjacent angles of a parallelogram, which means they sum to 180°.

  • m∠B + m∠C = 180°
  • 3x - 9 + 39 = 180
  • 3x + 30 = 180
  • 3x = 150
  • x = 50

Correct choice is A

lesya692 [45]3 years ago
3 0

Hello There!

<u>ANSWER:</u>

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If you need a explanation, just comment below! :)

AnimeVines

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