Solve using the elimination method. Use a graphing calculator to check your answer.
x + 
y = 4
x - 2y = 21
A. (6, 8)
B. (-6, -8)
C. (6, -8)
D. (-6, 8)
Answer: C
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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. 
C. 
D. 
Write an expression for the general or nth term, an, for the geometric sequence.4, - 1, 
, - 
, . . .
A. an = 
n-1
B. an = - 4
n-1
C. an = 4
n-1
D. an = 4(-4)n-1
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
Estimate the area of the shaded region by using the Trapezoidal Rule with n = 2. Round the answer to the nearest tenth.
