Problem

Banks The table gives the number of banks in the United States for selected years from 193...

Banks The table gives the number of banks in the United States for selected years from 1935 to 2009.

a. Create a scatter plot of the data, with x equal to the number of years after 1900.


b. Find a quadratic function that models the data.


c. Use the model to estimate the number of banks in 2007.


d. In what years does the model estimate that the number of banks in the U.S. equals 5818?

Year

Number of Banks

1935

15,295

1940

15,772

1950

16,500

1960

17,549

1970

18,205

1980

18,763

1990

15,158

2000

9905

2009

8185

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