physics, newtons law?

Question

A 1.00 kg object is observed to have an acceleration of = 19.0 m/s2 in a direction θ = 33.0° north of east. The force 2 acting on the object has a magnitude of 10.3 N and is directed north. Determine the magnitude and direction of the force 1 acting on the mass.

Answer 1

You can certainly calculate the net force acting on the mass, can't you? (F = m a ring any bells?)
And you know what one of the forces is (it was given to you in the problem).
So what's the big deal with subtracting one vector from another to get the answer?

Doug