Answer:
The correct option is C
m
Step-by-step explanation:
The exterior angle of a triangle is equal to the sum of the opposite non-adjacent interior angles.
The theorem above leads us to the next equation:
5x + 5 = x + (2x+ 15)
Solving the above equation:
5x + 5 = x + 2x+ 15
5x + 5 = 3x + 15
5x - 3x = 15 - 5
2x = 10
x = 10/2 = 5
We know that m
m
= 10 + 15
= 25