Determine whether the given equation is a rational function.f(x) = 
A. Yes
B. No
Answer: B
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Use the product rule to simplify the expression. Write the result using exponents.x3 ? x7
A. x7 B. x3 C. x11 D. x10
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. 36.6%; $268 million B. 35.8%; $276 million C. 41.2%; $264 million D. 34.0%; $271 million
Use Gaussian elimination to solve the system of equations.x+ 2y+ 2z= 12 5y+ 4z= 17? z= 3
A. (4, 1, 3) B. (3, 1, 4) C. (4, 3, 1) D. No solution
Solve the exponential equation using the method of "relating the bases" by first rewriting the equation in the form eu = ev.ex - 4 = 
x + 4
A. 
B. 
C. 
D. 