Question

just trying to improve my math skills and I really can't figure out how to do this

Answer 1

Explanation:

Corresponding angles formed by two parallel lines and a transversal are congruent.

The indicated angles are corresponding angles, therefore their measures are equal:

$x+9=2x-111$

Solving for x:

$\begin{gathered} x+9-x=2x-x-111 \\ 9=x-111 \\ x=9+111=120 \end{gathered}$

Answer:

x = 120º