1. The problem statement, all variables and given/known data Determine the magnitude of the projection of force F = 700N along the u axis. 2. Relevant equations Cosθ = (A • B)/(||A|| * ||B||) 3. The attempt at a solution I'm guessing I have to use the above equation, but my problem is finding the B vector. A is easy enough (<-2, 4, 4> I believe), but what about that B? Or am I thinking of this in the wrong way?