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    Vector Addition Homework: Magnitude and Angle Calculations

    Homework Statement Two vectors are given by a = 2.3 x - 9.7 y and b = -18.6 x + 2.8 y. What is the magnitude of a? What is the angle between vector b and the positive x-axis? What is the magnitude of the vector a + b? Homework Equations I don't know The Attempt at a Solution...