Magnitude and Direction of Scaled Vectors Practice Test

Given $\mathbf{v} = \langle 8,15\rangle$ and scalar $c=-\tfrac{1}{2}$, which statement correctly describes $c\mathbf{v}$?

Vector $\mathbf{v}$ has magnitude $12$ and direction $30^\circ$ from the positive $x$-axis. What are the magnitude and direction of $3\mathbf{v}$?