I have no idea I need help!!!!

Hmmm. Is there a question here?

3[90o] + (-4) + F = 0

3i + (-4) + F = 0
F = 4 - 3i = 5N[-37o] = 5N[37o] S. of E.
=5N[53o] E. of S.

Of course, I'm here to help! Please let me know what specific question or problem you need assistance with, and I'll do my best to explain how to find the answer.