Solve the problem.Suppose, for a certain drug, the following results were obtained: Immediately after the drug was administered, the concentration was 10 milligrams per milliliter. Eleven hours later, the concentration had dropped to 2.1 milligrams per milliliter. The concentration decays exponentially according to the law 
Determine the value of k for this drug.
A. k = -0.1419
B. k = 0.1419
C. k = -0.8161
D. k = -0.0067
Answer: B
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A. 
B. 
C. 
D. 
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