Solve the problem.The concentration C (arbitrary units) of a certain drug in a patient's bloodstream can be modeled using where t is the number of hours since a 500 milligram oral dose was administered. Using the TABLE feature of a graphing utility, find the time at which the concentration of the drug is greatest. Round to the nearest tenth of an hour.

A. 7.4 hours
B. 8.1 hours
C. 6.6 hours
D. 8.9 hours

Answer: C

Mathematics

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Assume that the cities lie on the same north-south line and that the radius of the earth is 6400 km. Find the latitude of Spokane, WA if Spokane and Jordan Valley, OR, are apart.

A. 52.46 °N B. 39.5 °N C. 38.8 °N D. 47.5 °N

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Mathematics

Find the probability.A committee of 9 members is voting on a proposal. Each member casts a yea or nay vote. On a random voting basis, what is the probability that the final vote count is unanimous?

A.
B.
C.
D.