Answer:
Explanation:
for the first one, solve by using the equation
180 = 43 + (x) + (x + 39)
137= x + x + 39
98 = 2x
x = 49
x + 39 = 88
for the second one, 5 and 7 are vertical angles, which are the two equal angles on opposite ends of an intersection. This means the answer is E.
for the third one, to find the exterior angle, you have to find that last angle inside the triangle. that means subtracting 85 and 65 from 180 to get 30. Now, subtract that 30 from 180 to get the exterior angle c. Straight lines are 180 degrees, so by finding that other angle and subtracting it from the total 180, you find the exterior angle. The exterior angle c is 150 degrees.