Answer
$\lt9, -6\gt$ and $3 \sqrt {13}$
Work Step by Step
Since, $3u=3\lt 3, -2 \gt =\lt9, -6\gt$
The magnitude of a vector is: $|n|=\sqrt{n_1^2+n_2^2}$
Now, $|\lt9, -6\gt|=\sqrt{9^2+(-6)^2}=\sqrt {117}=3 \sqrt {13}$
Thus, answers are: $\lt9, -6\gt$ and $3 \sqrt {13}$
