The number (in billions) of pieces of mail handled by the U.S. Post Office each year from

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The number (in billions) of pieces of mail handled by the U.S. Post Office each year from 1980 through 2009 can be approximated by
where t is the number of years since 1980. Find and interpret the rate of change in the volume of mail for the following years.

a. 1995 

b. 2005

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Calculus With Applications

ISBN: 9780321831101

10th Edition

Authors: Margaret L Lial, Raymond N Greenwell, Nathan P Ritchey

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