## Precalculus (6th Edition) Blitzer

$A$, $c$
In the model for limited logistic growth, $A= \frac{c}{1+ae^{-bt}}$, the amount at time $t$ is represented by $A$, and this value can never exceed $c$ since as $t \to \infty$, we have $ae^{-bt} \to 0$ so $A \to c$.