Evaluate the expression.
A. ±12
B. 0
C. 12
D. -12
Answer: C
Mathematics
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Perform the operation. Write the answer as a fraction in lowest terms.
+ 
A. 
B. 3
C. 
D. 1
Mathematics
Find the exact perimeter. Then approximate your answer to the nearest tenth.
A. 13
, 31.8
B. 22
, 53.9
C. 9
, 22.0
D. 26
, 63.7
Mathematics
Identify the type of sampling described by the proposal.At a local technical school, five auto repair classes are randomly selected and all of the students from each class are interviewed.
A. convenience sample B. simple random sample C. systematic sample D. cluster sample E. stratified sample
Mathematics
Solve the system of equations by Gaussian elimination.
A. {(2, 1, 5)} B. {(5, 1, 2)} C. {(5, 2, 1)} D. ?
Mathematics