Problem

Phone Bill The figure shows the average monthly cell phone bill in the United States...

Phone Bill The figure shows the average monthly cell phone bill in the United States between 1998 and 2008.

a. Draw tangent lines for 2001, 2005, and 2007. Estimate and record the slopes of these lines.

b. Use the information in part a to sketch a rate-of-change graph for the average monthly cell phone bill. Label both axes with units as well as values.

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Solutions For Problems in Chapter 2.6