Find the domain of the rational function. f(x) = 
A. 
B. 
C. 
D. 
Answer: A
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Graph the function. Describe its position relative to the graph of the indicated basic function.f(x) = e-0.4x; relative to f(x) = ex
A. Stretched vertically
B. Stretched horizontally
C. Stretched horizontally;
reflected across the y-axis
D. Stretched vertically;
reflected across the y-axis
Use the graph of the function f(x) to locate the local extrema and identify the intervals where the function is concave up and concave down.
A. Local minimum at x = 3 ; local maximum at x = -3 ; concave up on (0, ?); concave down on (-?, 0) B. Local minimum at x = 3 ; local maximum at x = -3 ; concave down on (0, ?); concave up on (-?, 0) C. Local minimum at x = 3 ; local maximum at x = -3 ; concave up on (-?, -3) and (3, ?); concave down on (-3, 3) D. Local minimum at x = 3 ; local maximum at x = -3 ; concave down on (-?, -3) and (3, ?); concave up on (-3, 3)
Solve the problem.The amount of alcohol in the bloodstream, A, declines at a rate proportional to the amount, that is, 
. If 
for a particular person, how long will it take for his alcohol concentration to decrease from 0.10% to 0.05%? Give your answer to the nearest tenth of an hour.
A. 2.3 hr B. 3.5 hr C. 4.6 hr D. 0.2 hr
Solve the problem.The following table shows the market prices per pound that a trucker can get for his load of fruit in three cities: San Francisco (S.F.), Las Vegas (L.V.), and Los Angeles (L.A). 
The trucker has a load of 1000 pounds of peaches and 3000 pounds of apples. Write the information from the table as a 2 x 3 matrix B. Write a row matrix A for which the entries represent the number of pounds of each type of fruit in the truck. Find 
A.
C = 
B.
C = 
C.
C = 
D.
C = 