Chapter 3, Problem 11P

SSM (a) In unit-vector notation, what is the sum $\stackrel{\to }{a}$ + $\stackrel{\to }{b}$ if $\stackrel{\to }{a}$ = (4.0 m) $\hat{i}$ + (3.0 m) $\hat{j}$ and $\stackrel{\to }{b}$ = (−13.0 m) $\hat{i}$ + (7.0 m) $\hat{j}$? What are the (b) magnitude and (c) direction of $\stackrel{\to }{a}$ + $\stackrel{\to }{b}$?