Suppose the number of bacteria are increasing exponentially, We can model the number of bacteria at a given time t, using the formula: f(t)=ae(tk) where, k=constant of proportionally and a=initial number; thus; f(t)=2000e(0.005t) Therefore the population after 12 hours will be: f(12)=2000e^(0.005*12) f(12)=2,123.67=2,123 bacteria