Identify the row operation that produces the resulting matrix.
? 
A. (-1)R2 ? R2
B. R1 + (-1)R2 ? R2
C. (-1)R1 + R2 ? R2
D. R1 + (-1)R2 ? R1
Answer: B
Mathematics
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Simplify the expression by rationalizing the denominator.
A. 
B. 
C. 
D. 
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Evaluate the expression without using a calculator.
3
A. 
B. 3
C. 
D. 
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Simplify the complex fraction.
A. 
B. 0
C. -1
D. -9
Mathematics
Explain the mistake in the graph.
A. x - y ? 5 is shaded on the wrong side. B. x - y ? 5 should be a dotted line. C. x + y < -1 should be a dotted line. D. x + y < -1 is shaded on the wrong side.
Mathematics