← The table shows projections of sales (in billions of dollars) of hepatitis C treatments for a certain region from 2012 to 2016. Complete parts (a) through (c). Year 2012 2013 2014 y= (Type an equation. Use integers or decimals for any numbers in the equation. Round to three decimal places as needed.) 2015 2016 Sales ($ billions) D 4.3 4.4 6.5 8.1 9.8 a. What is the quadratic function that best models these sales as a function of the number of years after 2010? Let x represent the number of years after 2010 and y represent the number of billions of dollars in sales of treatments.

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