I’m confused because i this angle is less than 180 degrees but more than 90 degrees am i just totally wrong. i don’t know i’m confused. plz explain. thx

Step-by-step explanation:

Angles on opposite sides of the point where lines cross are called "vertical angles." (The same lines define both angles, but they have only the vertex in common.) Their measure is irrelevant. The important characteristic of vertical angles is that they are equal in measure.

Since the angles have equal measures, we can equate the expressions for them:

  3x +20 = 10x -15

  35 = 7x . . . . . . . . . add 15-7x to both sides of the equation

  5 = x . . . . . . . . . . . divide by 7

Then the measure of the angles is ...

  3·5 +20 = 35