The numbers of polio cases in the world are shown in the table for various years.
\begin{tabular}{|c|c|}
\hline Year & Number of Polio Cases (thousands) \
\hline 1988 & 350 \
\hline 1992 & 138 \
\hline 1996 & 30 \
\hline 2000 & 4 \
\hline 2005 & $ 3.2 $ \
\hline 2007 & $ 1.3 $ \
\hline
\end{tabular}
Let $ f(t) $ be the number of polio cases in the world $ 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 answerv
Find an equation of $ f $. Hint
$ f(t)= $
Round the coefficients to 2 decimal places.
The number of polio cases Select an answerv by Select an answerv per year.
Predict the number of polio cases in $ 2018 . $
Predict in which year there will be 1 case of polio.
Find the approximate half-life of the number of polio cases. Hint
years
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