Applying Newton's Second Law

A box of mass 2.75 kg sits on a table. Neglect friction. You pull on a string tied to the right side of the box, exerting a force of 20.0 N at an angle of 35.0 degrees above the horizontal. Your friend exerts a horizontal force of 12.0 N by pulling on a string on the other side of the box.

(a) What is the box's acceleration?

(b) What is the normal force exerted on the box by the table?

Draw the free-body diagram - show all the forces acting on the box.