The table gives the population of the world in the 20th century.

(a) Estimate the rate of population growth in 1920 and in 1980 by averaging the slopes of two secant lines.
(b) Use a graphing calculator or computer to find a cubic function (a third-degree polynomial) that models the data.
(c) Use your model in part (b) to find a model for the rate of population growth in the 20th century.
(d) Use part (c) to estimate the rates of growth in 1920 and 1980. Compare with your estimates in part (a).
(e) Estimate the rate of growth in 1985.

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Population Population (In millons)Year(in milllons) 1900 1910 1920 1930 1940 1950 1650 1750 1860 2070 2300 2560 1960 1970 1980 1990 2000 3040 3710 4450 5280 6080