International Trade—Rice Exports: The Southeast Asian country of Thailand exports more ric...

International Trade—Rice Exports: The Southeast Asian country of Thailand exports more rice than any other country in the world. The rice exports from Thailand from 2000 to 2010 can be modeled by the linear function

 f(x) = 0.16x + 7.26 0 ≤ x ≤ 10

where x represents the number of years since 2000, and f(x) represents the annual Thai rice export, measure in millions of metric tons. (Source: USDA Economic Research Service.)

(a) Use the definition of derivative to determine f′(x).

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(b) Evaluate and interpret f′(5).