Concept explainers
In Exercises 49–54, assume that a constant rate of change exists for each model formed.
Urban Population. The following table lists data regarding the percentage of the world population considered urban in 1960 and in 2014.
YEAR, x (in number of years after 1960) |
PERCENTAGE OF WORLD POPULATION THAT WAS URBAN |
1960, ? 0 |
34%, or 0.34 |
2014, 54 |
54%, or 0.54 |
Data: Global Health Observation Data, World Health Organization |
a. Use the two data points to find a linear function that fits the data. Let
b. Use the function of part (a) to estimate the percentage of the world population considered urban in 1990. Predict the percentage that will be considered urban in 2020.
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