Answer:
x = 40 degrees
Step-by-step explanation:
a quadrilateral must have 360 degrees inside of it
so
to find what x is
we must subtract all the other angles from 360
100 + 100 + 120 = 320
360 - 320 = 40
x = 40
that is your answer
Answer:simple 320 x 2 x = 640
