Question1. $(\vec{i} \times \vec{j}) \cdot \vec{k}=\vec{i} \cdot(\vec{j} \times \vec{k})$.
2. If $\vec{v}$ and $\vec{w}$ are any two vectors, then $\|\vec{v}+\vec{w}\|=\|\vec{v}\|+\|\vec{w}\|$.
3. The value of $\vec{v} \cdot(\vec{v} \times \vec{w})$ is always zero.
4. For any scalar $c$ and any vector $\vec{v}$, we have $\|c \vec{v}\|=c\|\vec{v}\|$. earn $50 \%$ partial credit for 2 - 3 correct answers. Answers Submit Answers npted this problem 2 times. corded score is $0 \%$. empts remainina.