a. $\bold{w}=\bigg\lang \frac{24}{25},\frac{-18}{25}\bigg\rang$; b. $\bold{q}=\bigg\lang \frac{51}{25},\frac{68}{25}\bigg\rang$, $\bold{v}=\bold{w}+\bold{q}=\bigg\lang \frac{24}{25},\frac{-18}{25}\bigg\rang + \bigg\lang \frac{51}{25},\frac{68}{25}\bigg\rang$