---

Exponential Growth Equation

N_t=N₀e^rt

where as :

N_t = Population density after time t;

N₀ = Population density after time 0;

r = intrinsic rate of natural increase;

e = base of natural log.

Logistic Growth Equation $${dN \over dt} = rN ({ k-N \over k}) $$

Where as:

N = Population density at time t;

r = Intrinsic rate of nutual increase;

k = Carring capicty

Population Density $${N _{t+1}} ={ N _t} +[{(B + I) - (D + E)} ] $$

Where as:

N_t+1 = Population density at time t+1;

N_t = Population density at time t;

B = Birth

D = Death

I = Immigration

E = Emmigration