The numbers of polio cases in the world are shown in the table for various years. Year Number of Polio Cases (thousands) 1988 350 1992 138 1996 36 2000 4 2005 3.2 2007 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? If you use Desmos to find an exponential model, do not forget the check the LOG Mode Box. Exponential Find an equation of f. Hint 了(t) Round the coefficients to 4 decimal places. The number of polio cases is Select an answer v by Select an answer ♥ per year. Predict the number of polio cases in 2019. Hint Predict in whích year there will be 1 case of polio. Hint Find the approximate half-life of the number of polio cases. Hint years

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