Evaluate the expression for the given values of the variables, if possible.2 ? (-m) ? n
m = -10, n = -10
A. -120
B. -200
C. -20
D. -220
Answer: B
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Use Stokes' Theorem to calculate the circulation of the field F around the curve C in the indicated direction.F = x2i + xyj + yk; C: the counterclockwise path around the perimeter of the rectangle in the x-y plane formed from the x-axis, y-axis , x = 2 and y = 9
A. -162 B. - 81 C. 81 D. 162
Solve the problem.7 + 11 + 15 + . . . + 223 =
A. 
B. 
C. 
D. 
E. none of these
Find the general form of the equation for the line with the given properties.Slope = 
; containing (0, 4)
A. -2x + 3y = -12 B. -2x - 3y = 12 C. -2x + 3y = 12 D. 3x - 2y = -12
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. 28.8%; $272 million B. 27.0%; $379 million C. 30.9%; $382 million D. 38.4%; $383 million