Simplify the rational expression. If the rational expression cannot be simplified, so state.
A. - 
B. -1
C. 
D. 1
Answer: A
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Find the coordinates of the point.
?
?
A. (3,–5) B. (3,5) C. (5,–3) D. (1, 5) E. (–5,–3)
The position vector of a particle is r(t). Find the requested vector.The velocity at t = 0 for r(t) = cos(4t)i + 2ln(t - 9)j - 
k
A. v(0) = -4i - 
j
B. v(0) = 4i - 
j
C. v(0) = -
j
D. v(0) = 
j
The equation of motion is given for a particle, where s is in meters and t is in seconds. Find the acceleration after 5 seconds.
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