1. The problem statement, all variables and given/known data Referring to the vectors in the figure, express the sum A + B + C in unit vector notation. http://i.imgur.com/ajMkK.png 2. Relevant equations I'm not sure if it wants me to add Dy, I've tried it both times and masteringphysics won't take either answer. 3. The attempt at a solution I'm assuming we need Ax, Ay, Bx, By, Cy, Cx and add Dy. Ay= sin40 x 1.5 = .96 Ax= Cos40 x 1.5 = 1.15 Bx= Cos19 x 2.0 = 1.89 By= Sin19 x 2.0 = .65 Cx= Cos25 x 1 = .906 Cy= sin25 x 1 = .42 Dy= 1.5 The sum would be (3.946, 3.53)? Would appreciate any help on this problem, I'm not really quite sure what I'm missing or if I did the trig wrong.