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The resident population P (in thousands) of West Virginia from 2000 through 2014 can be modeled by
where t is the year, with t = 0 corresponding to 2000. (Source: U.S. Census Bureau)
(a) During which year(s) was the population increasing? decreasing?
(b) During which year, from 2000 through 2014, was the population the greatest? the least?
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