Find the Length and Direction (When Defined) of U × $\sqrt { 215 } ; \frac { 1 } { \sqrt { 215 } } ( - 3 \mathbf { i } - 5 \mathbf { j } + 3 \mathbf { k } )$

Multiple Choice

Find the length and direction (when defined) of u × v.
-u = 3i + 5j - 3k, v = -6i - 10j + 6k

A) $\sqrt { 215 } ; \frac { 1 } { \sqrt { 215 } } ( - 3 \mathbf { i } - 5 \mathbf { j } + 3 \mathbf { k } )$
B) $\sqrt { 129 } ; \frac { 1 } { \sqrt { 129 } } ( - 3 \mathbf { i } - 5 \mathbf { j } + 3 \mathbf { k } )$
C) $0 ; - 3 \mathbf { i } - 5 \mathbf { j } + 3 \mathbf { k }$
D) 0 ; no direction