Help with physics homework! The magnitude keeps turning out as 9.34 m.?

In a second contest, the three displacements given are 70.6 m , 51 degrees west of north; 15.7 m straight north; and 90.7 m, 43 degrees south of east. What magnitude does the winner calculate for the displacement to find the keys to the Porsche? I know that the resultant vector is found with the 3 displacements by... show more In a second contest, the three displacements given are 70.6 m , 51 degrees west of north; 15.7 m straight north; and 90.7 m, 43 degrees south of east. What magnitude does the winner calculate for the displacement to find the keys to the Porsche?

I know that the resultant vector is found with the 3 displacements by adding their x/y components. I need to find magnitude of the resultant and the angle of the resultant (in degrees south east) Please show the steps.
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