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. 37.5%; $210 million
B. 35.8%; $209 million
C. 34.9%; $207 million
D. 39.6%; $209 million
Answer: D
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Use the circle graph to solve the problem.The circle graph below gives the number of residents in the residence halls at the state university.
Write the ratio as a fraction in lowest terms of the number of residents at Fisher to the number of students at Brown.
A. 
B. 
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D. 
Decide whether the equation is an identity, a conditional equation, or a contradiction. Give the solution set.-6x + 108 + 3(2x - 33) = 0
A. Identity; {all real numbers} B. Conditional; {2} C. Conditional; {1} D. Contradiction; ?
Solve the system of nonlinear equations using the method of elimination.
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B. (
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C. (
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D. (
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Find the annual straight-line rate of depreciation for the estimated life.6 years
A. 16.7% B. 1.7% C. 8.3% D. 6%