Answer
x = 12°
Step-by-step explanation
We jave been told that the line OC is perpendicular to AD.
This means that the Angle AOC is 90°.
But,
Angle AOB + Angle BOC = Angle AOC
3x + (5x - 6) = 90°
3x + 5x - 6° = 90°
8x = 90° + 6°
8x = 96°
Divide both sides by 8
(8x/8) = (96°/8)
x = 12°
Hope this Helps!!!