Chapter 3, Problem 56P

Find the sum of the following four vectors in (a) unit-vector notation, and as (b) a magnitude and (c) an angle relative to +x.

$\begin{array}{l}\stackrel{\to }{P}\text{: }10.0\text{ m, at 25}\text{.0° counterclockwise from +}x\hfill \\ \stackrel{\to }{Q}\text{: }12.0\text{ m, at 10}\text{.0° counterclockwise from +}y\hfill \\ \stackrel{\to }{R}\text{: }8.00\text{ m, at 20}\text{.0° clockwise from }-y\hfill \\ \stackrel{\to }{S}\text{: }9.00\text{ m, at 40}\text{.0° counterclockwise from }-y\hfill \end{array}$