Let y denote the percentage of the world population that is urban x years after 1980. According to recently published data, y has been a linear function of x since 1980. The percentage of the world population that is urban was 39.5 in 1980 and 45.2 in 1995.
(a) Determine y as a function of x.
(b) Graph this function in the window [0, 30] by [30, 60].
(c) Interpret the slope as a rate of change.
(d) Determine graphically the percentage of the world population that was urban in 1990.
(e) Determine graphically the year in which 50% of the world population will be urban.
(f ) By what amount does the percentage of the world population that is urban increase every 5 years?
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