Posted by **Kim** on Sunday, March 9, 2014 at 9:56pm.

A model for the length of daylight (in hours) in Philadelphia on the tth day of the year is

L(t) = 12 + 2.8 sin[(2π/365)(t − 80)].

Use this model to compare how the number of hours of daylight is increasing in Philadelphia on March 21 and April 21. (Assume there are 365 days in a year. Round your answers to four decimal places.)

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