Online Sales of Used Autos The amount (in millions of dollars) of used autos sold online in a certain country is expected to grow in accordance with the figures gives in the following table (x 0 corresponds to 2011). 0 PM 1 2 Year, x Sales, y 12.8 13.9 14.75 15.15 15.75 (a) Find an equation of the least-squares line for these data. x 3 4 (b) Use the result of part (a) to estimate the sales of used autos online in 2016, assuming that the predicted trend continued. x million

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