Question

The population of the world in 1987 was 5 billion and the growth rate was estimated at3 percent per year.the population size (in billions) can be modeled by the formula A = 5(1.03)t where t is the number of years after 1987. Find the projected world population in 1995 . Give your answer in terms of billions of people.

Answer 1

6.3 billion people

Explanation:

`A=5(1.03)^t`

The "base year" is 1987 when there were 5 billion people. That year corresponds to t = 0 (t measures years after 1987)

That makes 1995 = 1995 - 1987 = 8, so t = 8.

Evaluate
`A=5(1.03)^8 \approx 6.3`