Answer:
50
Step-by-step explanation:
When two parallel lines are cut by a transversal, we see that same side exterior angles sum to 180 degrees.
It's like the blue angle and the green angle add together to sum 180. So you can construct an equation knowing this to find what x is:
[tex]2x+30+x=180\\3x+30=180\\3x=180-30\\3x=150\\x=\frac{150}{3}\\x=50[/tex]
(The reason for the answer is the first line I wrote)
