SOLUTION: The concentration of a drug in the body fluids is given by C=C0*e^−0.8t, where C0 is the initial dosage and t is the time in hours elapsed after administering the dose. If 45mg

Algebra ->  Logarithm Solvers, Trainers and Word Problems -> SOLUTION: The concentration of a drug in the body fluids is given by C=C0*e^−0.8t, where C0 is the initial dosage and t is the time in hours elapsed after administering the dose. If 45mg       Log On


   

Question 1198346: The concentration of a drug in the body fluids is given by C=C0*e^−0.8t, where C0 is the initial dosage and t is the time in hours elapsed after administering the dose. If 45mg of a drug is given, how much time elapses until 28mg of the drug remains? Round your answer to two decimal places, if necessary.
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
C=C%5Bo%5De%5E%28-0.8t%29

Your question would mean, to solve for t, in 28=45e%5E%28-0.8t%29, and you could begin by finding logarithms of both sides (base e).