Forces in Two Dimensions - Mission F2D3 Detailed Help

An object is at equilibrium. The individual forces acting upon the object are shown in the diagram at the right. The magnitude of the net force experienced by this object is ...

Definition of Equilibrium:
is the condition in which all the individual forces acting upon an object are balanced.
Put your calculator away - you won't be needing it for this question. (And if you do use it, then you are probably going to miss the question.) If an object is at equilibrium, then all the individual forces are balanced. There is no unbalanced force acting upon the object. If there is no unbalanced force acting upon the object, then the net force is 0 N. If you know your concept of equilibrium, the math involved in this concept is quite easy.