Find the directrices of the hyperbola.x2 - y2 = 25
A. y = ± 
B. x = ± 
C. y = ± 5
D. x = ± 
Answer: B
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Round the number as indicated.34,939 to the nearest ten-thousand
A. 3 B. 30,000 C. 40,000 D. 34,930
Solve the problem.Find f(k) when f(x) = 3x2 + 4x + 5.
A. 9k2 + 16k + 25 B. 3k2 + 16k + 5 C. 3k2 + 4k + 5 D. 3k2 + 4k + 25
Solve the problem.When you were born, your uncle put $1000 into an investment account for you. The return on this money was rather consistent over the years, resulting in the pattern of growth depicted in the following graph.
In what year did your investment reach double the original amount?
A. At age 6. B. At age 9. C. never D. At age 7.
Use properties of logarithms to expand the logarithmic expression as much as possible. Where possible, evaluate logarithmic expressions without using a calculator.log3 
A. 4 - log3
B. log381 - log3
C. 4log33 - 
log3(x - 1)
D. 4 - 
log3(x - 1)