Cell Phones Using the CTIA Wireless Survey for 1985–2009, the number of U.S. cell phone subscribers (in millions) can be modeled by
y = 0.632x2 − 2.651x + 1.209
where x is the number of years after 1985.
a. Graphically find when the number of U.S. subscribers was 301,617,000.
b. When does the model estimate that the number of U.S. subscribers would reach 359,515,000?
c. What does the answer to (b) tell about this model?
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