In this picture, m∠AOC = 68° and m∠COD = (2x + 5)°. If ∠AOC and ∠COD are complementary angles, then what is the value of x?
Since ∠AOC and ∠COD are complementary angles, their sum must be 90°.
m∠AOC + m∠COD = 90°
68° + (2x + 5)° = 90°
2x + 73 = 90
2x = 17
x = 8.5
Therefore, the value of x is 8.5.