The table below gives the annual sales (in millions) of a product. A 1998 1999 2000 2001 2002 2003 2004 2005 year 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 20 sales 135 153 167 177 183 185 183 177 167 153 135 113 87 57 23 -15 -57 -103 -1 What was the average rate of change of annual sales a) Between 2009 and 2010 b) Between 2009 and 2015 millions of dollars/year millions of dollars/year

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