Vector a Has a Magnitude of 3 $-90.0^{\circ}$ With the Positive X-Axis

Vector A has a magnitude of 3.0 units and makes an angle of $-90.0^{\circ}$ with the positive x-axis.Vector B has a magnitude of 4.0 units and makes an angle of $-120^{\circ}$ with the positive x-axis.What is the direction of the vector sum of A + B referenced to the positive x-axis?

A) $-107^{\circ}$
B) $55^{\circ}$
C) $-55^{\circ}$
D) $-145^{\circ}$

Correct Answer:

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