First solve the triangle:
75° + 75° + x = 180°
150° + x = 180°
x = 180° - 150°
Therefore x = 30°
Then, use the geometrical property of vertically opposite angles.
Therefore. x° = 30°
I believe the answer is AD=7.0
I think the answer would be A. I hope this helps. But i am not that sure
