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Average yearly increased world's population

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In 1987, the world's population reached 5 billion people, and by 2012 the world's population is expected to reach 7 billion people.
(Source: U.S. Census Bureau).

(a) Find the average yearly increase in the world's population from 1987 to 2012.
(b) Write a linear equation that estimates the world's population P in billions x years after 1987.

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  • MSc, Indian Institute of Technology - Roorkee (I.I.T.-ROORKEE)
  • BSc, Banaras Hindu University
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