Answer:
-93.7° . . . or . . . 266.3° (measured CCW from the +x axis)
Explanation:
The attached screen shot of a calculator's output shows the answer to this problem along with several other of your vector sum problems.
Of course, any negative angle can be converted to the corresponding positive angle by adding 360°.
All of the inputs and outputs are of the form ...
magnitude∠direction
where the direction is the angle measured counterclockwise from the +x axis. (Some of your problems, like this one, use a different angle reference, so the angles need to be converted.)
