Not sure how to do this one, can I get some tips? Thanks.
Try using $\displaystyle cos{\theta}=\frac{u\cdot v}{||u|| \;\ ||v||}$
If you get 1, then $\displaystyle cos^{-1}(1)=0$. That means there is no angle between them and they are parallel.
$\displaystyle u\cdot v$ is the dot product of u and v.
i.e. $\displaystyle u\cdot v=([-6,3,3],[-4,2,2])=36$
$\displaystyle ||u|| \;\ ||v||=\sqrt{(-6)^{2}+3^{2}+3^{2}}\sqrt{(-4)^{2}+2^{2}+2^{2}}=36$
$\displaystyle cos{\theta}=\frac{36}{36}=1$
$\displaystyle cos^{-1}(1)=0$
Parallel.