Moon Illumination The accompanying table shows the percentage of the moon that will be illuminated at midnight for the 31 days of January, 2010. (U.S. Naval Observatory, http://aa.usno.navy.mil).
Use the sinusoidal regression feature of a graphing calculator to find the equation for a sine curve that fits the data. Graph the data and the curve on your graphing calculator. Find the period from the equation. Use the equation to predict the percentage of the moon that will be illuminated on February 4, 2010.
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