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Spread of Disease During an epidemic, the number of people who have never had the disease and who are not immune (they are susceptible) decreases exponentially according to the function $$f ( t ) = 15,000 e ^ { - 0.05 t }$$
$$\left. \begin{array} { l l l } { \text { (a) } 15,000 } & { \text { (b) } 9098 } & { \text { (c) } 5249 } \end{array} \right.$$