Ok, I think I got it.
To get the x-component of a vector in standard position, you multiply its length by the cosine of the reference angle; to get the y-component of a vector in standard position, you multiply its length by the sine of the reference angle. Therefore...
x-component of 7 N vector = 7cos(0) = 7
y-component of 7 N vector = 7sin(0) = 0
7 N vector = (7,0)
x-component of 11 N vector = 11cos(105) = -2.847009496
y-component of 11 N vector = 11sin(105) = 10.62518409
11 N vector = (-2.847009496,10.62518409)
x-component of 15 N vector = 15cos(252) = -4.635254916
y-component of 15 N vector = 15sin(252) = -14.26584774
15 N vector = (-4.635254916,-14.26584774)
If this is wrong I'm seriously going to cry.