Simplify the rational expression. If the rational expression cannot be simplified, so state.
A. 
B. cannot be simplified
C. 
D. 
Answer: D
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Factor the special products.z2 - 9
A. (z + 3)(z - 3) B. (z - 3)2 C. (z + 3)2 D. prime
Graph the function by starting with the graph of 
and using transformations.f(x) = 3(x + 2)2 - 2
A. 
B. 
C. 
D. 
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. 34.9%; $207 million C. 39.6%; $209 million D. 37.5%; $210 million
Use the summation properties and rules to evaluate the series. The following rules may be needed: 
.
A. 40 B. - 70 C. - 80 D. - 50