Question

The population of a city grew from 23,000 in 2010 to 25,000 in 2015.

Answer 1

The average rate of change during this time interval is 400 population per year

The average rate of change during this time interval is expressed as:

• Rate of change = change in population/change in time

Change in population = 25000 - 23000

• Change in population = 2000

Change in time = 2015 - 2010

• Change in time = 5 years

Substitute into the formula;

Rate of change = 2000/5

Rate of change = 400

Hence the average rate of change during this time interval is 400 population per year

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