The population of the world in 1987 was 5 billion and the growth rate was estimated at 2% per year. Assume that the population follows an exponential growth model. Find the projected world population in 1995. Give your answer in terms of billions of people.

Period is the time it takes for one “cycle” to complete. in the parent sine function, period is 2*pi since sin(0) = 0, sin(pi/2) = 1, sin(pi) = 0, sin(3pi/2) = -1, and sin(2pi) = 0. at that point, the sequence repeats itself. i’m not sure if your graph is similar to the sine function since you didn’t provide a picture, but you can find the period by looking at a graph.