13. A scientist puts a sample of 4000 bacteria in a Petri dish The number of bacteria
decreases at a rate of 2% per hour. Write an equation to represent the number of
bacteria, b, as a function of time measured in hours, t.
b(t)=4000(2)^t
b(t)=4000+0.98t
b(t)=4000+2t
b(t)=4000(0.98)^t