Mathematics

Problem

For any vectors

\mathbf{p},\mathbf{q},\mathbf{r}

in space, which identity below illustrates the associative property of vector addition? a)

k(\mathbf{p}+\mathbf{q})=k\mathbf{p}+k\mathbf{q}

|\mathbf{p}+\mathbf{q}|=|\mathbf{p}|+|\mathbf{q}|

(\mathbf{p}+\mathbf{q})+\mathbf{r}=\mathbf{p}+(\mathbf{q}+\mathbf{r})

\mathbf{p}+\mathbf{q}=\mathbf{q}+\mathbf{p}