The table shows the number of music players sold in millions of units for various years. Complete parts (a) and (b). Year 2009 2010 2007 51.6 2008 54.5 Sales 53.9 50.3 2006 39.8 2011 42.8 (a) Use regression to find a quadratic function I that models the data. Let x = 0 correspond to 2006. I(x) = (Round to the nearest thousandth as needed.)

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