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Mathematics 21 Online
OpenStudy (anonymous):

In 2002, Sarnia, Ontario received its maximum amount of sunlight, 15.28 hrs, on June 21, and its least amount of sunlight, 9.08 hrs, on December 21. Due to the earth's revolution about the sun, the hours of daylight function is periodic. Determine an equation that can model the hours of daylight function for Sarnia, Ontario. On what day(s) can Sarnia expect 13.5 hours of sunlight?

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