During a two-week period the number of people in a town who have a virus follows the model $f(t)=15,000 e^{-.27 t}$, where $f(t)$ is the number of people who have the virus after $t$ days. Use a calculator to graph $y=f(t)$ for $0 \leq t \leq 14$, and determine $f^{\prime}(7)$. What does $f^{\prime}(7)$ tell about the situation?

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The Answer of During a two-week period the number of people in a town who have a virus follows the model $f(t)=15,000 e^{-.27 t}$, where $f(t)$ is the number of people who have the virus after $t$ days. Use a calculator to graph $y=f(t)$ for $0 \leq t \leq 14$, and determine $f^{\prime}(7)$. What does $f^{\prime}(7)$ tell about the situation?

During a Two-Week Period the Number of People in a Town