The components of vector are Ex = +150 N/C and Ey = -100 N/C.

The components of vector are Ex = +150 N/C and Ey = -100 N/C.

If we measure all angles with respect to the +x axis and counter-clockwise as the positive direction, the direction of is closest to ...
1. -326
2. -56
3. -34
4. +34
5. +304
[they're all in degrees]

Tan(x) = rise/run

tan(x) = -100/150

x = artcan (-100/150)

x = -33.7 so -34

Hope this helps :)