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a) What is the magnitude of his resultant displacement?

okay so i wont explain everything i did but im pretty sure i got the right numbers.

for my resultant vector i get (2.09899, -4.63). the magnitude should be 5.08357. but its somehow not the right answer and im not sure what i did wrong.

whats weird is that i needed to find the position of this vector which would be arctan(2.09899/-4.63) + 360. which would be 294.07136 degrees. THIS IS THE CORRECT ANGLE!! so then wouldn't that mean that (2.09899, -4.63) are the right x and y values?!?!?

what am i doing wrong?

thanks for any help!!