How to solve this physics problem?

Posted on 2015-08-22 07:47:00 in Physics by LUEK

Force A has a magnitude of 200lb and points 35° N of W. Force B points 40° E of N. Force C points 30° W of S. The resultant of the three vectors has a magnitude of 260lb and points 85° S of W.

(a) What is the magnitude of Force B?
(b) What is the magnitude of Force C?

Honestly don't know where to start. TIA.ss

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