Which degrees is the answer

75°

Step-by-step explanation:

Since the 2 angles are supplementary and TC is a perpendicular bisector, we know that m∠ATC is 90°

All we need to do is simply subtract 15° from 90° to find m∠ATB:

90 - 15 = 75°

Solution,

Let m<ATB be X

(sum of angle in straight line)

subtract 105 on both sides

Hope this helps ...

Good luck on your assignment..