Find the product.(3x - 1)(3x + 6)
A. 6x2 + 15x + 15
B. 9x2 + 15x - 6
C. 6x2 + 15x - 6
D. 9x2 + 15x + 15
Answer: B
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Using Green's Theorem, calculate the area of the indicated region.The astroid r(t) = (7 cos 3t)i + (7 sin3 t)j, 0 ? t ? 2?
A. 2?
B. 
?
C. 
?
D. 
?
Find the eccentricity of the ellipse.x2 + 36y2 = 36
A. 
B. 
C. 
D. 
Find the graph of the derivative of the function.
?
?
A. ?
B. ?
C. ?
D. ?
E. ?
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. 35.8%; $209 million B. 37.5%; $210 million C. 39.6%; $209 million D. 34.9%; $207 million