Solve the problem.Suppose, for a certain drug, the following results were obtained: Immediately after the drug was administered, the concentration was 4 milligrams per milliliter. Twelve hours later, the concentration had dropped to 1.6 milligrams per milliliter. The concentration decays exponentially according to the law 
Determine the value of k for this drug.
A. k = 0.0764
B. k = -1.4100
C. k = -0.0764
D. k = -0.0098
Answer: A
Mathematics
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