Help!!! Find the measure of the arc or angle indicated.

Mathematics

1 answer:

Serhud [2]2 years ago

4 0

Answer:

77°

Step-by-step explanation:

m∠QDC = 1/2(mQB + mBC)

5x + 17= 1/2( 4x - 6 + 9x + 4)
10x + 34 = 13x - 2
13x - 10x = 34 + 2
3x = 36
x = 12

m∠QDC = 5*12 + 17 = 77

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