The population of a City The graph shows the population of a city from 1900 to 2000.

1.What is the average rate of change of the population between 1930 and 1950? Show your reasoning.

2. For each interval, decide if the average rate of change is positive or negative.

a. from 1930 to 1940

b. from 1950 to 1970

c. from 1930 to 1970

3. In which decade (10-year interval) did the population grow the fastest? Explain how you know.

help!