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The following table shows the numbers of U.S. cellular subscriberships (in millions) from 1985 to 2002. Source: The CTIA Semi-Annual Wireless Industry Survey
Assume that the number of U.S. cellular subscriberships, in millions, can be modeled by the function , where t is the number of years past 1980. Find the function that models the instantaneous rate of change of the U.S. cellular subscriberships.
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