went 21 - 27 = -6 blocks north
went 17 east
magnitude = sqrt (17^2 + 6^2)
tangent of angle south of east = 6/17
angle clockwise from north (compass bearing from origin) = 90 + tan^-1(6/17)
A delivery truck travels 21 blocks north, 17 blocks east, and 27 blocks south.
What is its final displacement from the origin (direction)?
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