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 start of 2000. I(t) = -31t2 + 800t – 3,000 thousand barrels per day (9 sts 13) According to the model, approximately when were oil imports to the country greatest? HINT [See Example 1.] (Round your answer to two decimal places.) t = How many barrels per day were imported at that time? (Round your answer to two significant digits.) thousand barrels

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