Average Monthly Temperature in Phoenix The following
Chapter 6, Problem 52(choose chapter or problem)
Average Monthly Temperature in Phoenix The following function approximates average monthly temperature y (in F) in Phoenix, Arizona. Here x represents the month, where x = 1 corresponds to January, x = 2 corresponds to February, and so on. (Source: www.weather.com) 1x2 = 19.5 cos c p 6 1x - 72 d + 70.5 When is the average monthly temperature (a) 70.5F (b) 55F? (Modeling) Alternating Electric Current The study of alternating electric current requires the solutions of equations of the form i = Imax sin 2pt, for time t in seconds, where i is instantaneous current in amperes, Imax is maximum current in amperes, and f is the number of cycles per second. (Source: Hannon, R. H., Basic Technical Mathematics with Calculus, W. B. Saunders Company.) Find the least positive value of t, given the following data. 5
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