Question: Most breeding birds in the northeast US migrate else- where during the winter. The number of bird species in an Ohio forest preserve oscillates between

Most breeding birds in the northeast US migrate else- where during the winter. The number of bird species in an Ohio forest preserve oscillates between a high of 28 in June and a low of 10 in December.
(a) Graph the number of bird species in this preserve as a function of t, the number of months since June. Include at least three years on your graph.
(b) What are the amplitude and period of this function?
(c) Find a formula for the number of bird species, N, as a function of the number of months, t since June.

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