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  • 5 years ago

The gross national product of a certain country is N(t)=t^2+3t+121 billion dollars where t is the number of years after 1990. At what percentage rate will the GNP be changing with respect to time in 1995? I will assume t=5 then get N'(5)=2t+3. I come up with 13%. Is that correct?

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