The gross domestic product​ (GDP) of a certain​ country, which measures the overall size of the economy in billions of​ dollars, can be approximated by the function g(z)=639z + 8826​, where z=10 corresponds to the year 2010. Estimate the GDP​ (to the nearest billion​ dollars) in the given years.​(a) 2005​(b) 2011​(c) 2014

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