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. 39.6%; $209 million
C. 34.9%; $207 million
D. 35.8%; $209 million
Answer: B
Mathematics
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x + 3.
A. 
a - 5
B. 
C. 
a + 3
D. 
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Determine whether the function is one-to-one by graphing and using the horizontal line test.f(x) = 6.29
A. Yes B. No
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Solve the number problem by finding the value of the unknown number.The sum of 7 and four times a number is 27.
A. 4 B. 10 C. 8 D. 5
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Multiply.(9y2 - 8)(9y2 + 8)
A. 81y4 - 144y2 + 144 B. 81y4 - 144y2 - 64 C. 81y2 + 64 D. 81y4 - 64
Mathematics