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Drug Concentrations- Calculate the concentration of a drug in the blood after at a given time.

1.
Suppose that a drug has a removal rate constant of r = 0.080 1/hr and an initial concentration (C0 ) of 5.0 mg/L. Find the drug concentration after 4.0 hours to the nearest tenth using the model, C(t) = C0- rt.
 
Answer:
mg/L 
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