The table below lists the average weekly earnings of U.S. production workers in recent years.

Sources: U.S. Bureau of Labor Statistics, U.S. Department of Labor
a) Use a graphing calculator to fit a linear sequence regression function an = an + b to the data, where n is the number of years since 2004.
b) Estimate the average weekly earnings in 2010, in 2012, and in 2015.

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Average Weekly Earnings of U.S. Production Workers Year, 2004, 0 2005, 1 2006, 2 2007, 3 2008, 4 2009, 5 $529.09 544.33 567.87 590.04 607.95 617.11