The graph shows how many meters above a stream, y, that a bucket on a water wheel is rotating for a given number of seconds x.
How many degrees is the bucket rotating in 10 s?
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Im very unsure i tried doing it myself to have you guys double check but I am unsure
it reaches its full rotation after the wavelength number of seconds, or 35-15 or 20 seconds, so the answer is 10/20 * 360 degrees or 180 degrees.
HOPE THIS HELPED!