Use the best-fitting exponential model to determine the answer to each question. (For problems using calendar years, “reset the clock” so that t = 0 in the year for which you first have data.)
Exercise
A BlackBerry is an all-in-one mobile device that includes phone, e-mail, Web browser, and organizer features. The number of BlackBerry subscribers has grown according to the following table.
Year t | 2001 | 2002 | 2003 | 2004 | 2005 |
Thousands of subscribers S | 165 | 321 | 534 | 1070 | 2510 |
Source: USA Today.
a. At what average annual rate did the number of BlackBerry subscribers grow during this period?
b. If this trend continues, how many BlackBerry subscribers would you expect there to be in 2010?
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