Question

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ZC and ZD are vertical angles with MZC = –2x + 90 and MZD = x – 30.
What is mZD
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Answer 1

10

Explanation:

Vertical angles are equal to each other

-2x + 90 = x - 30

90 + 30 = x + 2x add like terms

120 = 3x divide both sides by 3

40 = x

angle <ZD is x - 30 so the answer is 10