This is the concept of exponential growth, To get the number of bacteria after 10 days we use the formula: f(t)=ae^(kt) where; a=initial number=5000 k=constant of proportionality= 0.04 t=time=10 days f(t)=future number thus the number of bacteria in 10 days will be: f(t)=5000e^(0.04*10) f(t)=7,459.12 The answer is 7,459.12