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Mathematics 7 Online
OpenStudy (anonymous):

The first sunrise in the United States each day is observed from Cadillac Mountain on Mount Desert Island in Maine. The time of the sunrise can be modeled by t(m) = 1.665 sin pi/6 (m + 3) + 5.485, where t is hours after midnight and m is the number of months after January 1. When does the sunrise at 6:00 A.M.?

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