The task goes as following.
The angle between two vectors $\vec{w}$ and $\vec{r}$ is less than 90 degrees. Vector $\vec{w}$ is given by $\vec{w} = \vec{u} + \vec{v}$ where $\vec{u} \parallel \vec{r}$ and $\vec{v}$ $\perp$ $\vec{r}$. Find $\vec{w} \cdot \vec{r}$ when $\vert\vec{u}\vert = 4 $ and $ \vert\vec{r}\vert = 3$
I've been looking at this on and off all day. If it's really easy break it to me easy. I already feel really dumb. yey.