Practice Test 8

For vectors $\mathbf{u}=\langle 3,0\rangle$ and $\mathbf{v}=\langle 0,4\rangle$, what is the magnitude $\lVert \mathbf{u}+\mathbf{v} \rVert$?

For vectors $\mathbf{u}=\langle 3,4\rangle$ and $\mathbf{v}=\langle -1,2\rangle$, using component-wise addition, what is $\mathbf{u}+\mathbf{v}$ in component form?