Solve the problem.The concentration of a certain drug in the bloodstream t minutes after swallowing a pill containing the drug can be approximated using the equation 
where C(t) is the concentration in arbitrary units and t is in minutes. Find the rate of change of concentration with respect to time at t = 8 minutes.
A. - 
units/min
B. - 
units/min
C. - 
units/min
D. - 
units/min
Answer: A
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Solve the problem.To measure the width of a river, a surveyor starts at point A on one bank and walks 72 feet down the river to point B. He then measures the angle ABC to be 
Estimate the width of the river to the nearest foot. See the figure below. 
A. 66 ft B. 173 ft C. 30 ft D. 28 ft
Find the smallest possible area of an isosceles triangle that is circumscribed about a circle of radius r=4.
Solve the problem.The percent of people who say they plan to stay in the same job position until they retire has decreased over recent years, as shown in the table below.
Find a power function that models the data in the table using an input equal to the number of years from 2000. According to the unrounded model, what percent of people will plan to stay in the same job position until retirement in 2014?
A. 18% B. 22% C. 24% D. 19%
Determine the intervals on which the function is increasing, decreasing, and constant.
A. Increasing on (-?, -2); Decreasing on (-2, ?) B. Increasing on (-2, ?); Decreasing on (-?, -2) C. Increasing on (-2, ?); Decreasing on (-2, ?) D. Increasing on (-?, -2); Decreasing on (-?, -2)