Answer:
C) 17
Explanation:
Since the angle needed to be 51˚ we need to figure out which number that multiplies by 3 will get to 51˚ so 17 is the answer
17 times 3 is 51˚
17 =x
The angles are vertical angles, so they are equal
51 = 3x
Divide each side by 3
51/3 = 3x/3
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