Since there are two angles already filled in, we should know that a straight line equals 180°, meaning that we can add the two angles we already have (which makes 129) and subtract it by 180
Inverse operations are operations that undo each other. In this case, 10 + 2 = 12, and 12 - 2 = 10 A multiplication example could be 4 x 2 = 8, and 8 ÷ 2 = 4
