physics

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The magnitude of vector A is 18 units at an angle of 90 degrees with the x-axis, and the magnitude of vector B is 12 units at an angle of 330 degrees with the x-axis. What vector C must be added to the vectors A and B so that the resultant of these three vectors points in the negative x direction and has a magnitude of 7.5 units? Express the vector C by giving its magnitude and direction.

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