posted by COFFEE .
What are the x and y components of a vector a in the xy plane if it's direction is 215 degrees counterclockwise from the positive direction of the x axis and its magnitude is 12.9 m ?
you would be in the third quadrant, so both x and y are negative.
The values would have to satisfy two equations:
x^2 + y^2 = 12.9^2 and y/x = tan 35º
They are relatively easy to solve, I got x appr -10.567 and y appr. -7.399