Question

In: Advanced Math

The numbers of polio cases in the world are shown in the table for various years....

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 6
2005 3.2
2007 1.3



Let f(t)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 Exponential Linear

Find an equation of f. Hint

f(t)=f(t)=    Round the coefficients to 4 decimal places.

The number of polio cases is Select an answer decreasing increasing  by Select an answer 25.55% 368665.63% 3686.6563% 74.45%  per year.

Predict the number of polio cases in 2014.

Hint

Predict in which 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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