Posted by **Jillian** on Thursday, August 23, 2012 at 7:18pm.

The percentage of the moon's surface that is visible to a person standing on the Earth varies with the time since the moon was full. The moon passes through a full cycle in 28 days, from full moon to full moon. The maximum percentage of the moon's surface that is visible is 50%. Determine an equation, in the form P = A cos (Bt) + C for the percentage of the surface that is visible, P, as a function of the number of days, t, since the moon was full. Show the work that leads to the values of A, B, and C.

- Calculus -
**Anonymous**, Monday, February 22, 2016 at 5:47pm
25cos(pi/14) +25

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