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OpenStudy (anonymous):
For the years 1989-1996, the amount A (in billion of dollars) spent on long distance telephone calls in the US can be modeled by A = 0.560t^2 + 0.488t + 51.
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OpenStudy (anonymous):
t= number of years since 1989.
OpenStudy (anonymous):
In what year did the amount spent reach $60 billlion?
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