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15. A vector a in the xy-plane has a length of 9 units and points in a direction that is 120° counterclockwise from the pos- itive x-axis, and a vector b in that plane has a length of 5 units and points
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15. A vector a in the xy-plane has a length of 9 units and points in a direction that is 120° counterclockwise from the pos- itive x-axis, and a vector b in that plane has a length of 5 units and points in the positive y-direction. Find a . b.

User Jack Noble
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Refer to the photo taken.
15. A vector a in the xy-plane has a length of 9 units and points in a direction that-example-1
User Jamshidh
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