The following table gives the online sales, in billions of dollars, from 2000 and projected to 2017.
(a) Find the power function that models these data, with x as the number of years past 1990.
(b) Graph the data and the function on the same axes.
(c) What does the model predict the online sales revenue to be in 2020?

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Sales (billions) Sales (billions) Year Year 2000 $28 $134 2009 2001 34 2010 171 2002 44 2011 202 226 2003 56 2012 70 2004 2013 259 87 2005 2014 297 2006 106 2015 339 2016 2007 126 386 2008 132 2017 434