Fuel Consumption  The daily consumption C (in gallons) of diesel fuel on a farm is modeled...

Fuel Consumption  The daily consumption C (in gallons) of diesel fuel on a farm is modeled by

where t is the time (in days), with t = 1 corresponding to January 1.

(a) What is the period of the model? Is it what you expected? Explain.

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(b) What is the average daily fuel consumption? Which term of the model did you use? Explain.

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(c) Use a graphing utility to graph the model. Use the graph to approximate the time of the year when consumption exceeds 40 gallons per day.