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) = −35t2 + 800t − 3,000 thousand barrels per day (9 ≤ t ≤ 13) 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

Calculus For The Life Sciences
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Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
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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 start of 2000.
I(t) = −35t2 + 800t − 3,000 thousand barrels per day (9 ≤ t ≤ 13)
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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