Huang Schwartz
03/24/2024 · Middle School
12) The concentration, in parts per million, of a particular drug in a patient's blood \( x \) hours after the drug is administered is given by the function \( f(x)=-x^{4}+13 x^{3}-42 x^{2}+54 x \) How many hours after the drug is administered will it be eliminated from the bloodstream. \( \begin{array}{llll}\text { A) } 15 \text { hours } & \text { B) } 9 \text { hours } & \text { C) } 11 \text { hours } & \text { D) } 6 \text { hours }\end{array} \)
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The drug will be eliminated from the bloodstream after 9 hours.
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