If t is the number of months since June, the number of bird species, N, found in an Ohio
Chapter 3, Problem 24(choose chapter or problem)
If t is the number of months since June, the number of bird species, N, found in an Ohio forest oscillates approximately according to the formula N = f(t) = 19+9cos$ 6 t%. (a) Graph f(t) for 0 t 24 and describe what it shows. Use the graph to decide whether f(1) and f(10) are positive or negative. (b) Find f(t). (c) Find and interpret f(1), f(1), f(10), and f(10).
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