Question

Two forces on the object are F1 = 3.6 N at 74° below the +x-axis and F2 = 3.6 N at 34° above the -x-axis. Is there a third force on the object, and why?

If yes, what is it? (If there is none, specify zero magnitude and direction.)
magnitude
N direction
° (counterclockwise from the +x-axis)