Doctors treated a patient at an emergency room from 2:00 P.M. to 7:00 P.M. The patient's blood

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Doctors treated a patient at an emergency room from 2:00 P.M. to 7:00 P.M. The patient's blood oxygen level L (in percent) during this time period can be modeled by
L = ˆ’0.270t2 + 3.59t + 83.1, 2 ‰¤ t ‰¤ 7
where t represents the time of day, with t = 2 corresponding to 2:00 P.M. Use the model to estimate the time (rounded to the nearest hour) when the patient's blood oxygen level was 93%.
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