For a given day in the year, the temperature in Tucson at 6:00 AM is 78 degrees Fahrenheit. By 6:00 PM, the temperature rises to 102 degrees, before cooling off again to 78 degrees by 6:00 AM the following morning. The graph below shows the temperature over time (in hours) since 6:00 AM. 102 A 12 18 (a)What is the average temperature for that day? 90 (b)Determine the function which best describes this daily change in temperature. Use t as your input variable. F(t)= -12 cos (2)

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