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Mathematics 14 Online
OpenStudy (anonymous):

What is the angle between the vector v=(-7,8) and the positive x-axis?

OpenStudy (anonymous):

\[\tan^{-1} (y/x)\] \[\tan^{-1} (8/-7) = -48.8\] Since it's in quadrant 2, 180+ (-48.8) = 131 degrees

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