Solve the problem.The percent of concentration of a certain drug in the bloodstream 
after the drug is administered is given by K(x) = 
. At what time is the concentration a maximum?
A. 2.5 hr
B. 7 hr
C. 4.9 hr
D. 4 hr
Answer: B
Mathematics
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Solve the absolute value equation.|x + 4| = 9
A. {-5} B. {13, 5} C. {-13, 5} D. ?
Mathematics
Write the satement in symbols. Let x represent the unknown number.Five times a number, increased by nine.
A. 5x + 9 B. 5 + 9x C. 5x + 45 D. 5x - 9
Mathematics
Simplify the expression.
- sin x
A. sec x B. -csc x C. csc x D. -sec x
Mathematics
Write the decimal as a fraction or a mixed number. Express your answer in simplest form.99.923
A. 199
B. 99
C. 19
D. 
Mathematics