Round the decimal to the given place value.2.681 (nearest hundredth)
A. 2.67
B. 2.69
C. 2.68
Answer: C
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Solve the problem.The concentration of a drug in the bloodstream, measured in milligrams per liter, can be modeled by the function, 
where t is the number of minutes after injection of the drug. When will the drug be at its highest concentration? Approximate your answer rounded to two decimal places.
A. t = 3.65 minutes after the injection is given B. t = 4 minutes after the injection is given C. at the time of injection D. t = 0.55 minutes after the injection is given
Complete the identity.The expression 
+ cot ?is to be the left hand side of an equation that is an identity. Which one of the following four expressions can be used as the right hand side of the equation to complete the identity?
A. cos ? B. sec ? C. csc ? D. tan ?
Solve the system of equations by Gaussian elimination.
A. {(4, -5, -2)} B. {(-2, -5, 4)} C. {(-2, 4, -5)} D. ?
For the given geometric sequence, find the limit of the infinite series, if it exists. 
? 
n - 1
A. No limit
B. 
C. 
D. 