Solve the problem.Suppose, for a certain drug, the following results were obtained: Immediately after the drug was administered, the concentration was 7 milligrams per milliliter. Eleven hours later, the concentration had dropped to 2.8 milligrams per milliliter. The concentration decays exponentially according to the law 
Determine the value of k for this drug.
A. k = -0.0134
B. k = 0.0833
C. k = -1.6180
D. k = -0.0833
Answer: B
Mathematics
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A. 
B. 
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A. 
B. 
C. 
D. 
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Solve.The cost of having a car towed is given by the linear function C(x) = 2x + 65, where C(x) is in dollars and x is the number of miles the car is towed. Find the cost of having a car towed 12 miles.
A. $67 B. $89 C. $79 D. $24
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Divide. Write the answer in lowest terms and as a whole or mixed number where possible.28 ÷ 
A. 21
B. 37
C. 
D. 7
Mathematics