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The table below shows the total number of hamburgers sold at various times during the day for a popular fast food restaurant. Assume the function used to model the data in the table is a continuously increasing function.


9 a.m.

11 a.m.

12 p.m.

1 p.m.

2 p.m.

4 p.m.

5 p.m.

7 p.m.


  1. At approximately what rate were hamburgers being sold at 10 a.m.? 4p.m.?

  2. For what time interval was the rate of sales greatest?

    Use the eTool below to help solve the problem.
    Click on the link to the right to view the full version of the eTool. Calc 11-98 HW eTool