International Trade—Rice Imports: According to a February 2010 report on the PBS documentary series Frontline, Iran used to be an exporter of rice, but now it is a net importer. The annual amount of rice imported to Iran from 2000 to 2010 can be modeled by
f(x) = 81.19x + 786.83 0 ≤ x ≤ 10
where x represents the number of years since 2000, and f(x) represents the annual Iranian rice imports, measures in thousands of metric tons. (Source: USDA Economic Research Service.)
(a) Use the definition of derivative to determine f′(x).
(b) Evaluate and interpret f′(8).
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