# 30. Population Growth and Decline The graph shows the population P in a small industrial city from 1950 to 2000. The variable x represents the number of years since 1950. (a) What was the average rate of change of P between x = 20 and x = 40? (b) Interpret the value of the average rate of change that you found in part (a). P (thousands) 50 40 30 20 10 10 20 30 40 50 * (yr)

Question

Population Growth and Decline The graph shows the
population P in a small industrial city from 1950 to 2000.
The variable x represents the number of years since 1950.
(a) What was the average rate of change of P between
x  20 and x  40?
(b) Interpret the value of the average rate of change that you
found in part (a).

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30. Population Growth and Decline The graph shows the population P in a small industrial city from 1950 to 2000. The variable x represents the number of years since 1950. (a) What was the average rate of change of P between x = 20 and x = 40? (b) Interpret the value of the average rate of change that you found in part (a). P (thousands) 50 40 30 20 10 10 20 30 40 50 * (yr)