Please help me out with these:

The population of the world in 1987 was 5 billion and the annual growth rate was estimated at 2 percent per year. Assuming that the world population follows an exponential growth model, find the projected world population in 1994. Your answer is Preview billionThe doubling period of a bacterial population is 10 minutes. At time t = 80 minutes, the bacterial population was 80000. What was the initial population at time t = 0? Preview Find the size of the bacterial population after 5 hours. Preview\f