QUESTION $20$

For the two vectors vec$(A)=-2\mathrm{.}0$hat$(i)+-6\mathrm{.}0$hat$(j)+4\mathrm{.}0$hat$(k)$ and vec$(B)=3\mathrm{.}0$hat$(i)+1\mathrm{.}0$hat$(j)+2\mathrm{.}0$hat$(k),$ what is the magnitude of vec$(A)+$vec$(B)?$

$7\mathrm{.}9$

$2\mathrm{.}0$

$11$

$3\mathrm{.}5$