Solve the logarithmic equation.log4(x + 7) + log4(x - 7) = 1
A. 4
B. 
C. 
D. 53
Answer: C
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Solve the problem. Unless stated otherwise, assume that the projectile flight is ideal, that the launch angle is measured from the horizontal, and that the projectile is launched from the origin over a horizontal surfaceA projectile is fired at a speed of 1160 m/sec at an angle of 32°. How long will it take to get 29 km downrange? Round your answer to the nearest whole number.
A. 29 sec B. 27 sec C. 31 sec D. It will never get that far downrange.
Use De Morgan's laws to write the negation of the statement.6 < 12 or 7 ? 15
A. 6 < 12 or 7 = 15 B. 6 ? 12 or 7 ? 15 C. 6 ? 12 or 7 = 15 D. 6 ? 12 and 7 = 15
Solve the problem.The area of a circle is found by the equation A = ?r2. If the area A of a certain circle is 81? square centimeters, find its radius r.
A. 9 cm
B. 9? cm
C. {9 cm, -9 cm}
D. 9
cm
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. 34.0%; $271 million B. 36.6%; $268 million C. 41.2%; $264 million D. 35.8%; $276 million