Sales of SUVs? (sport utility? vehicles) in the United States ?(in millions) for the years? 1990-1999 can be modeled by the quadratic function shown below.
?f(x) = 0.016x(squared) + 0.124x + 0.787
Here x = 0 represents? 1990, x = 1 represents? 1991, and so on. Use the model to approximate sales in 1999.