The following table lists the newspaper revenue, in billions of dollars, from classified ads for selected years from 1975 to 2013.

a) Use a graphing calculator to fit cubic and quartic functions to the data. Let x represent the number of years after 1975. Using R²-values, determine which function is the better fit.

b) Using the function found in part (a), estimate the newspaper revenue from classified ads in 1988 and in 2002.

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Year, x 1975, 0 1980, 5 1985, 10 1990, 15 1995, 20 2000, 25 2005, 30 2006, 31 2007, 32 2008, 33 2009, 34 2010, 35 2011, 36 2012, 37 2013, 38 Newspaper Revenue from Classified Ads, y (in billions of dollars) $ 2.159 4.222 8.375 11.506 13.742 19.608 17.312 16.986 14.186 9.975 6.179 5.648 5.028 4.626 4.140