First, take into account that angle 84° and angle p are supplementary angles, that is, they add up 180°. Then, for angle p you have:
m° = 180° subtract 84 both sides
m° - 84°m°Next, consider that angle p is three times as large as angle r, that is:mreplace the measure of angle p and divide by 3 both sides96°/3 = mmNext, take into account that angle q and angle p are supplemetary, then:m° replace the value of mm° = 180°mmThen, you have:m