Two vertically opposite angles are (3x + 10)° and (5x − 30)°. Find x.

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• A 100
• B 20
• C 10
• D 50

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Answer: B. 20

Vertically opposite angles are equal, so 3x + 10 = 5x - 30. Rearranging, 40 = 2x, so x = 20. Both angles then measure 70 degrees.

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