Find all the roots of the function. Use preliminary analysis and graphing to determine good initial approximations. Round to six decimal places.f(x) = ex + 
A. x ? -1.463056
B. x ? -1.462945
C. x ? -1.963056
D. x ? -0.463056
Answer: A
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Evaluate the spherical coordinate integral.
A. 
?
B. 
?
C. 
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D. 
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Use a calculator to compute. Round the result to two decimal places.-11,100.21 - 95,734.841
A. 84,634.63 B. -84,634.63 C. -11,100.21 D. -106,835.05
Write a slope-intercept equation for a line with the given characteristics.m = 0; passes through (5, -9)
A. x = 5 B. y = 5 C. y = -9 D. x = -9
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