Solve the problem.A product sells by word of mouth. The company that produces the product has noticed that revenue from sales is given by 
where x is the number of units produced and sold. If the revenue keeps changing at a rate of 
per month, how fast is the rate of sales changing when 100 units have been made and sold? (Round to the nearest dollar per month.)
A. $2667/month
B. $1333/month
C. $24,000/month
D. $27/month
Answer: A
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Solve the problem.If f(x) = x - 7 and g(x) = 4x - 2, find (fg)(x)
A. 4x2 - 31x + 14 B. 4x2 + 14x - 30 C. 4x2 - 30x + 14 D. x2 - 30x - 30
Solve the problem by integration.The current i (in A) as a function of the time t (in s) in a certain electric circuit is given by 
Find the total charge that passes a given point in the circuit during the first three seconds.
A. 1.276 C B. 11.486 C C. 3.829 C D. 3.807 C
Find another name for the given number, but with the denominator indicated.
= 
A. 
B. 
C. 
D. 
Solve the problem. Assume that probabilities are representative of the best strategies. Round to two decimal places, if necessary.A person has hired an investment broker to buy stock. The broker has three different stock funds that are of interest, but each is sensitive to a certain economic indicator that is impossible to predict. The indicator will be positive, neutral, or negative. The table below shows the payoffs in thousands of dollars. Find the expected value of the investment. 
A. 14.54 B. 46 C. 9.18 D. 42