The numbers of polio cases in the world are shown in the table for various years. Year Number of Polio Cases (thousands) 1988 1992 1996 2000 2005 2007 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? Select an answer ✓ Find an equation of f. Hint 350 138 34 5 3.2 1.3 f(t) The number of polio cases is Select an answer by Select an answe per year. Predict the number of polio cases in 2020. Hint Round the coefficients to 4 decimal places. Predict in which year there will be 1 case of polio. Hint years Find the approximate half-life of the number of polio cases. Hint

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