Answer:
157.38° CCW from +x axis
67.38° CCW from +y axis
n = (12/13)i +(5/13)j
Step-by-step explanation:
The reference angle is ...
arctan(15/36) ≈ 22.62° . . . . CW from the -x axis
The signs of the component vectors indicate this is a 2nd-quadrant vector, so the angles of interest are ...
157.38° CCW from +x axis
67.38° CCW from +y axis
The unit vector will be ...
n = cos(157.38°)i +sin(157.38°)j
n = (12/13)i +(5/13)j