Complementary angles add up to 90°
(x + 3) + (4x - 8) = 90
x + 3 + 4x - 8 = 90
5x - 5 = 90
5x = 95
x = 19
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Answer: x = 19
Complementary angles are two angles whose measures add up to 90 degrees.
Answer is A. 19
