posted by Jacob on .
The world population at the beginning of 1990 was 5.3 billion. Assume that the population continues to grow at the rate of approximately 2%/year and find the function Q(t) that expresses the world population (in billions) as a function of time t (in years), with t = 0 corresponding to the beginning of 1990. (Round your answers to two decimal places.)
(a). If the world population continues to grow at approximately 2%/year, find the length of time t0 required for the population to double in size.
(b). Using the time t0 found in part (a), what would be the world population if the growth rate were reduced to 1.2%/yr?
____ billion people
I don't understand how to set this problem up correctly.