
Concept explainers
All of the following exercises can be done with a graphing calculator if your instructor so directs. The calculator can also be used to check your work.
Population. The data in the following table give the population of Detroit since 1970 (see Exercise 18 section R.6)
Number of years, x, since 1970 | Population (in millions) |
0 | 1.5 |
10 | 1.2 |
20 | 1 |
30 | 0.95 |
40 | 0.71 |
a. Find the exponential regression curve,
b. Use the regression curve to estimate the population of Detroit in 2020 and 2025.

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