Answer:
d. 45°
Step-by-step explanation:
The angles are alternate interior angles, so they are equal in measure. So
m∠6 = m∠7
so
4x - 15 = x + 30 now solve for x
4x - x = 30 + 15
3x = 45
x = 15
But 15 isn't the measure of angle 6, it's just the x value, so plug 15 in to solve for angle 6
m∠6 = 4(15) - 15
m∠6 = 60 - 15 = 45°
