I don't understand what my professor is asking for.. can someone help me? Am I suppose to run a regression?

Use the 12-Year Gasoline Time series database on "Excel Databases.xls".Look at the time-series plot from January 1997 to May 2008 to predict the US Gasoline Price (cents).Then develop a linear model and a quadratic model to predict US Gasoline Price (cents) over this time period.Which model appears to be better at predicting US Gasoline Price and why?

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