Solve.
Drug Testing The concentration of a drug (in parts per million) in a patient’s bloodstream t hours after administration of the drug is given by the function
P(t) = −t4 + 12t3 − 58t2 + 132t.
a. Use the formula to determine when the drug will be totally eliminated from the bloodstream.
b. Use the graph to estimate the maximum concentration of the drug.
c. Use the graph to estimate the thne at which the maximum concentration occurs.
d. Use the graph to estimate the amount of time for which the concentration is above 80 ppm.
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