Solve the problem.The cylindrical storage vat in the picture has a base with radius of r and a height of r. The volume of the vat is the product of its height and the area of the base. Find the volume of the cylinder. 
A. 
?r3 in.3
B. ?r3 in.3
C. 
?r3 in.3
D. 2?r3 in.3
Answer: B
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Sketch the graph of the function.y = ln 
A. 
B. 
C. 
D. 
Solve the system by inspecting the graph of the equations.x + 5y = -145x - 5y = 20
A. 
B. 
C. ?
D. 
Provide an appropriate response.The number of loaves of whole wheat bread left on the shelf of a local quick stop at closing (denoted by the random variable X) varies from day to day. Past records show that the probability distribution of X is as shown in the following table. Find the probability that there will be at least three loaves left over at the end of any given day. 
A. 0.20 B. 0.65 C. 0.35 D. 0.15
Solve the problem.Economists use what is called a Leffer curve to predict the government revenue for tax rates from 0% to 100%. Economists agree that the end points of the curve generate 0 revenue, but disagree on the tax rate that produces the maximum revenue. Suppose an economist produces this rational function 
where R is revenue in millions at a tax rate of x percent. Use a graphing calculator to graph the function. What tax rate produces the maximum revenue? What is the maximum revenue?
A. 31.4%; $464 million B. 26.5%; $469 million C. 29.7%; $467 million D. 28.1%; $470 million