Solve the Problem $\mathbf { v } = 5 \mathbf { i } + \mathbf { j }$

Multiple Choice

Solve the problem.
-If $\mathbf { v } = 5 \mathbf { i } + \mathbf { j }$ and $\mathbf { w } = 9 \mathbf { i } + \mathbf { j }$ , find $\| \mathbf { v } + \mathbf { w } \|$ .

A) $6 \sqrt { 3 }$
B) $10 \sqrt { 2 }$
C) 4
D) $2 \sqrt { 74 }$