The following table gives the online sales, in billions of dollars, from 2000 and projected to 2017.
(a) Model these data with a power function E(t), where t is the number of years past 1990. Report the model with three significant digit coefficients.
(b) Use the reported model from part (a) to find the function that models the rate of change of online sales.
(c) Use the result from part (b) to find and interpret the rate of change of online sales in 2020.

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