Angle LOM and angle MON are complementary angles. If m∠LOM = (x + 15)° and m∠MON = 48°, which equation could be used to solve forx?

Since angle LOM and angle MON are complementary angles, their sum is 90 degrees.

Therefore, the equation that could be used to solve for x is:
(x + 15)° + 48° = 90°