Provide an appropriate response.A certain drug is eliminated from the bloodstream exponentially with a half-life of 12 hours. Suppose that a patient receives an initial dose of 25 milligrams of the drug at midnight. Estimate when the drug concentration will reach 20% of its initial level.
A. 40 hours
B. 16 hours
C. 58 hours
D. 28 hours
Answer: D
Mathematics
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Refer to the following normal curve, with mean ? and standard deviation ?.
A data value of 41 corresponds to a standardized value of
A. -0.5. B. -2. C. -1. D. -1.5. E. none of these
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Find the critical number(s), if any, of the function 
a. 4 b. ?4 c. ±?7 d. ±7
Mathematics
Determine algebraically whether the function is even, odd, or neither.f(x) = 
A. even B. odd C. neither
Mathematics
Find the value of the unique real number ? between 0 and 2? that satisfies the given conditions.tan ? = - 1 and sin ? > 0
A. 
B. 
C. 
D. 
Mathematics