I believe your answer is correct:

Given in the fourth quadrant then = -1.4 radians = -80.45 degrees.

Your answer matches:

but their answer is:

**EDIT

I think I may have found where whoever came up with the answer key made mistakes: if (a) they used instead of , and also (b) instead of simplifiying the term to as you have it they made it , that would explain it.