Solve the problem.The speed of a stream is 5 mph. If a boat travels 52 miles downstream in the same time that it takes to travel 26 miles upstream, what is the speed of the boat in still water?
A. 15 mph
B. 10 mph
C. 17 mph
D. 18 mph
Answer: A
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Solve.The size of the raccoon population at a national park increases at the rate of 
per year. If the size of the current population is 186, find how many raccoons there should be in 6 years. Use the equation
to solve and round to the nearest whole number.
A. Approximately 253 raccoons B. Approximately 251 raccoons C. Approximately 255 raccoons D. Approximately 257 raccoons
Add and simplify. Write the answer as a mixed numeral if possible.2
+ 1
A. 3
B. 3
C. 4
D. 3
Use the properties of logarithms to evaluate the expression.10log t
A. t B. 1 C. 10t D. 10t
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. 28.1%; $470 million B. 31.4%; $464 million C. 26.5%; $469 million D. 29.7%; $467 million