Vectors, Direction, and Net displacement

[rorushing4283]

I have been working on the following two problems and I can't seem to get any progress.
Any help from anyone would be greatly appreciated. I know it seems simple to those who are familiar but I have no background in this type of equations.

1. A helicopter travels northwest 70.7 miles, then straight east 100 miles, and finally straight south 100 miles. How far and in what direction is it from point of origin?



2. A ship sails 100 miles northwest then 141.4 miles due south. How far and in what direction is it from its starting location?

 

[rorushing4283]

for 2

100 miles NW
141.4 miles S

x=100cos135=-70.71
y=100sin135=70.71

Mag=sqrt(-70.71)^2+(70.71)^2
Mag=sqrt10000
Mag=100miles

is this on the right track for this problem?