please help! physics vector question pt 4

Question

Jolene walks 1.8 meters North, 9.9 meters West, and 1.1 meters South. Find the magnitude of her total displacement vector. Make sure you do the following in your answer:
include correct units
make your answer correct within 0.2
make your answer positive (because magnitudes are always considered positive)
put your answer in a form like one of these:
#.# m
##.# m

Answer 1

<0,1.8> + <-9.9, 0> + <1.1, 0>

<-8.8, 1.8>

What is the magnitude of this vector?