Mike M. also asked how to get the angle for #11.
In #10 you got a total x component and a total y component. You can draw where that would take you (in what quadrant) and find the angle knowing that tanθ=y/x if your θ is measured from the x-axis. However, they want the angle measured from the +x axis, so if your vector is in quadrant 1 then your answer would be between 0 and 90 degrees. If your vector is in quadrant 2 then your answer would be between 90 and 180 degrees. If your vector is in quadrant 3 then your answer would be between -90 and -180 degrees (measured counter-clockwise from the +x direction), and if your vector is in quadrant 4 then your answer would be between 0 and -90 degrees.
Good luck.
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