Answer:
x = 17
Step-by-step explanation:
angles Q and M are right angles (they each measure 90 degrees)
there are 360 degrees inside any 4-sided polygon
add the following to solve for x:
90 + 90 + 3x + 5 + 8x - 12 = 360
11x + 185 - 12 = 360
11x + 173 = 360
11x = 187
x = 187/11
x = 17
