How do you calculate the mathematical constant in an…

How do you calculate the mathematical constant in an…

How do you calculate the mathematical constant in an Population Ecology equation like Nt = No ert? 
Additional Requirements 

Other Requirements: You can see if you want to predict N into the far future, using the Malthusian exponential equation will be time consuming. For predicting N into the future, we tend to prefer the continuous growth model where Nt=N0*ert. Using this equation, calculate the predicted population size after 5 time periods given that N0=50 and r=-0.2. Hint: e is a mathematical constant.