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For two adjacent angles with measures x degrees and (x + 30) degrees that make up a 90 degree angle, what is x?

A. 60
B. 15
C. 30
D. 20

1 answer

D. 20

Explanation: Since the two angles are adjacent and add up to 90 degrees, we can set up the equation x + (x + 30) = 90. Simplifying this equation gives us 2x + 30 = 90. Solving for x gives us x = 30 - 15 = 20.