Answer:
B
Step-by-step explanation:
The exterior angle of a triangle is equal to the sum of the 2 opposite interior angles.
4 + 11x is an exterior angle of the triangle , so
4 + 11x = 6x + 14 + 45
4 + 11x = 6x + 59 ( subtract 6x from both sides )
4 + 5x = 59 ( subtract 4 from both sides )
5x = 55 ( divide both sides by 5 )
x = 11 → B
