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Use graphical methods to find the magnitude and direction of the vector: B.) A-B

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Vector A is 3.00 units in length and points along the positive x-axis. Vector B is 4.00 units in length and points along the negative y-axis. Use the graphical methods to find the magnitude and direction of the following vector:
B.) A-B

The work I need to show to complete this problem is a free body diagram, formulas, work w/units and answer.

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