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The table gives the cumulative sales of iPods since their introduction. Cumulative iPod Sales Sales Year (million iPods) 2003 0.32 2004 5.436 2005 27.233 2006 67.042 2007 118.672 2008 173.1 (a) Find the function for the quadratic model that gives sales In million iPods, where x is the number of years after 2003, with data from 0 S x S 5. (Round all numerical values to three decimal places.) s(x) = million iPods (b) Write the derivative for the sales model. (Round all numerical values to three decimal places.) s'(x) = million iPods per year (c) Calculate the rate of change of cumulative sales in 2006. (Round your answer to three decimal places.) mllllon IPods per year Interpret the rate of change of cumulative sales in 2006. (Round your answer to three decimal places.) In 2006, cumulative iPod sales were -Select v by million per year. Mdltlnnal Mall-rials