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The average monthly bill for wireless telephone subscribers from 1985 to 2008 can be modeled...

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The average monthly bill for wireless telephone subscribers from 1985 to 2008 can be modeled by B(x) = -1.275x+98.208, where x is the number of years after 1980. If this model remains valid, in what year will the average monthly bill be $48.48? The average monthly wireless phone bill would be $48.48 in the year

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