Answer:
33 deg
Explanation:
Since <POQ is a right angle, lines MQ and PO are perpendicular. That makes <PON a right angle with measure 90 deg.
m<MOP + m<MON = m<PON
3x - 3 + 4x + 9 = 90
7x + 6 = 90
7x = 84
x = 12
m<MOP = 3x - 3 = 3(12) - 3 = 36 - 3 = 33
m<MOP = 33