Answer
See image (directions are below).
Work Step by Step
$c.$
Translate the vector ${\bf v}$ so it starts where $ {\bf u}$ terminates.
Join the start of ${\bf u}$ with the end of ${\bf v}$.
$b.$
Translate the vector ${\bf w}$ so it starts where $ {\bf u+v}$ terminates.
Join the start of ${\bf u+v}$ with the end of ${\bf w}$.
$c.$
Translate the vector ${\bf -v}$ so it starts where $ {\bf u}$ terminates.
Join the start of ${\bf u}$ with the end of ${\bf -v}$.
$d.$
Translate the vector ${\bf -w}$ so it starts where $ {\bf u}$ terminates.
Join the start of ${\bf u}$ with the end of ${\bf -w}$.
