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 30 2000 5 2005 3.2 2007 1.3 Let 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? Find an equation of f. Hint t) : ' ' Round the coefficients to 4 decimal places. The number of polio cases is Select an answer v by [ Select an answer VI per year. Select an answer Predict the number of polio cases in 2014. 366301.89% 25.65% . ?4.35% Predict in which year there will be 1 case of polio. m :1 Find the approximate half-life of the number of polio cases. Hint