Find the magnitude of `2\vec{u} + 3\vec{v}`, where `\vec{u} = \langle 1,3, -9 \rangle` and `\vec{v} = \langle -5,2,5 \rangle`

Box 1: Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172
Enter DNE for Does Not Exist, oo for Infinity