Solve the problem.The percent of concentration of a certain drug in the bloodstream 
after the drug is administered is given by K(x) = 
. How long after the drug has been administered is the concentration a maximum? Round answer to the nearest tenth, if necessary.
A. 1.3 hr
B. 3 hr
C. 2.5 hr
D. 5 hr
Answer: D
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Find the surface area or volume.The region between the curve y = sinx, 0 ? x ? 1.9, and the x-axis is revolved about the x-axis to generate a solid. Use a table of integrals to find, to two decimal places, the volume of the solid generated.
A. 3.31 B. 3.47 C. 3.53 D. 3.66
Write as a single logarithm.log8 11 + log8 x + log8 6
A. log8 66x B. log8 (17 + x) C. 8 log (17 + x) D. 8 log 66x
Solve the problem.The loudness of a sound is measured in decibels (dB). The loudness L of a sound is related to its intensity I by the equation 
where I0 = 10-12 watts per square meter (W/m2) is the intensity of the faintest sound the human ear can detect. Find the dB level of a radio at average volume from 12 feet away when it has an intensity of 
W/m2.
A. ? 103 dB B. ? 113 dB C. ? 93 dB D. ? 83 dB
Use a graphing utility to find the inverse of the matrix, if it exists. Round answers to two decimal places, if necessary. 
A. 
B. 
C. 
D. 