Fill in the blank with one of the words or phrases listed below.
An equation that describes a known relationship among quantities is called a 
.
A. linear inequality in one variable
B. no solution
C. linear equation in one variable
D. formula
Answer: D
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Use a calculator to approximate the number. (Round your answer to three decimal places.)
?
A. -1.666 B. 5.474 C. -5.474 D. 0.789 E. 5.605
Find all real solutions to the equation.
+ 
= 4
A. {2, -2}
B. {
, -2}
C. {0}
D. {-2}
Use properties of logarithms to condense the logarithmic expression. Write the expression as a single logarithm whose coefficient is 1. Where possible, evaluate logarithmic expressions.
(log4 x + log4 y) - 6 log4(x + 7)
A. log4 
B. log4 
C. log4 
D. log4 
Solve the problem.A certain radioactive isotope has a half-life of approximately 1250 years. How many years to the nearest year would be required for a given amount of this isotope to decay to 70% of that amount?
A. 2171 yr B. 375 yr C. 643 yr D. 573 yr