table for various years. Year 1988 1992 1996 2000 2005 2007 Number of Polio Cases (thousands) 350 138 30 4 3.2 1.3 Let f(t) be the number of polio cases in thousands t years since 1980. Use a graphing calculator to draw a scattergram of the data. Is it better to model the data by using a linear or exponential model? (Exponential Find an equation of f. Hint f(t) = coefficients to 4 decimal places. The number of polio cases is (decreasing 25.77% per year. ✓ Round the Predict the number of polio cases in 2013. Hint by Predict in which year there will be 1 case of polio. Hint Find the approximate half-life of the number of polio Hint

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