In 2010, the worlds population reached 6.91 billion andwas increasing at a rate of 1.1%

Chapter 1, Problem 22

(choose chapter or problem)

In 2010, the worlds population reached 6.91 billion andwas increasing at a rate of 1.1% per year. Assume thatthis growth rate remains constant. (In fact, the growth ratehas decreased since 1987.)(a) Write a formula for the world population (in billions)as a function of the number of years since2010.(b) Estimate the population of the world in the year2020.(c) Sketch world population as a function of years since2010. Use the graph to estimate the doubling time ofthe population of the world.

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