Answer:
C
Step-by-step explanation:
its A cause 70 and (x+20) are Consecutive exterior angles and that means they are supplimentary (they both have a sum of 180)
180-70=110
but you cant use 110 because 110 +20= 130 which sums up to be more than 180 so you subtract 20.
110-20= 90
and there you go!
hope i helped :)
