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 − 1,000 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?

Question
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 − 1,000 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?

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