9x+18=90
9x=72
x=8
This is the answer for problem 10 above
Problem 11:
62+58= 120
180-120 =60
Therefore angle FEA is 60 degrees
59+ 61=120
180-120= 60
Therefore angle CHF is also 60 degrees
Rays:
EB and HD ; EA and HC are both parallel because they have equivalent degree angles