#### The value of some cell phones changes exponentially after initial release. Here are graphs showing the depreciation of two phones 1, 2, 3 and 4 years after they were released.

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comparing graphs of exponential functions
analyzing graphs of exponential functions

Anonymous

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PHONE A:

PHONE B:

- Which phone is more expensive to buy when it is first released?
- How does the value of each phone change with every passing year?
- Which one is falling in value more quickly? Explain or show how you know.
- If the phones continue to depreciate by the same factor each year, what will the value of each phone be 4 years after its initial release?
- For each cell phone, write an equation that relates the value of the phone in dollars to the years since release, t. Use v for the value of Phone A and w for the value of Phone B.