Determine whether a linear function or a quadratic function would be a more appropriate model for each set of graphed data. If linear, tell whether the slope should be positive or negative. If quadratic, tell whether the coefficient of x² should be positive or negative.

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Percentage (%) High School Students Who Smoke 40 35 30 25 20 15 €1 1 L 02 6 10 Year Data from www.cdc.gov