where is the population at time , is the initial population, is the rate of growth, and is time.
we are told that after 4 hours, the population triples. so if we start with at , we will have when . So let's plug those values into our equation.
So we have,
we are also told that when , the population is 1000000
so we have:
now solve for
once you find , you will have the equation that models this growth, part (b) won't be difficult after that. So find and try part (b) and we'll see how far you get
EDIT: This is my 33th post!!!