Average Monthly Temperature The average monthly temperature (in °F) in San Antonio, Texas, can be modeled by the function TT f (x) = 16.5 sin (x – 4) | + 68.5, 6. where x is the month, with x = 1 corresponding to January, x = 2 corresponding to February, and so on. (Data from National Climatic Data Center.) (a) Graph f in the window [0, 25] by [40, 90]. (b) Determine the amplitude, period, phase shift, and vertical translation of f. (c) What is the average monthly temperature for the month of December?

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