Answer:
Your answer is c = 70°.
Step-by-step explanation:
First, you have to solve for the angle a and b in order to then solve for c.
b is vertical angles with 60° so thus making them congruent :
b = 60° .
For a, a is supplement angle with 130° meaning these two angles add up to 180° : a + 130° = 180° =>
a = 50°
Now solve for c, the triangle adds up to 180°.
a + b + c = 180°
50° + 60° + c = 180°
110° + c = 180°
c = 70°
