## Calculus (3rd Edition)

Position vectors ${\bf{u}}$ with endpoints $A$, $B$ and $C$ in diagrams, such that ${\bf{u}} = r{\bf{v}} + s{\bf{w}}$.
1. Position vector ${\bf{u}}$ with endpoint $A$. ${\bf{u}} = \overrightarrow {OA} = r{\bf{v}} + s{\bf{w}}$, where $r$ and $s$ are scalars. 2. Position vector ${\bf{u}}$ with endpoint $B$. ${\bf{u}} = \overrightarrow {OB} = r{\bf{v}} + s{\bf{w}}$, where $r$ and $s$ are scalars. 3. Position vector ${\bf{u}}$ with endpoint $C$. ${\bf{u}} = \overrightarrow {OC} = r{\bf{v}} + s{\bf{w}}$, where $r$ and $s$ are scalars.