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 magnitude of the vector sum of A + B?

A) 1.0 units
B) 6.8 units
C) 4.0 units
D) -6.8 units

Correct Answer:

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