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Crude oil imports to one country from another for 2009-2013 could be approximated by the following model where t is time in years since the

Crude oil imports to one country from another for 2009-2013 could be approximated by the following model wheretis time in years since the start of 2000.

I(t) =31t2+ 800t2,000thousand barrels per day (9t13)

According to the model, approximately when were oil imports to the country greatest?

t=

How many barrels per day were imported at that time?

thousand barrels

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