Answer
see work below
Work Step by Step
The angle is
$$
\theta=\tan ^{-1}\left(\frac{4.72 \mathrm{\ m}}{-3.18 \mathrm{\ m}}\right)=-56.0^{\circ} \text { (with }-x \text { axis) }
$$
If measured counterclockwise from $+x$ -axis, the angle is then $180^{\circ}-56.0^{\circ}=124^{\circ} .$ Thus, converting the result to polar coordinates, we obtain
$$(-3.18,4.72) \rightarrow\left(5.69 \angle 124^{\circ}\right)$$
