Problem: A disoriented physics professor drives a distance 3.15km north, then a distance 2.50 km west, and then a distance 1.30km south. Find the direction of the resultant displacement, using the method of components.
So I have done this problem over and over and I keep getting -36.5 degrees west of north. But on Mastering Physics it keeps stating my answer is wrong.
What I did was calculate $\arctan((3.15−1.3)/(−2.5))$ to get the direction of the resultant am I wrong to compute what I wrote before?