The table gives the cumulative sales of ipods since their introduction. Cumulative iPod Sales Sales Year ( million ipods) 2003 3.12 2004 4.936 2005 27.333 2006 69.342 2007 118.372 2008 173.3 (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