Example 2
- Author:
- Walch Education
In 2008, about 66 million U.S. households had both landline phones and cell phones. This number decreased by an average of 5 million households per year. Use the table below to calculate the rate of change for the interval [2008, 2011].
- Determine the interval to be observed.
- Determine .
- Determine .
- Substitute ) and into the slope formula to calculate the rate of change.