Add or subtract, as indicated. Assume that all variables represent positive real numbers.
+ 9
- 8
A. -8
B. -50
C. 24
D. 50
Answer: B
Mathematics
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A. 8.5 sec B. 1.2 sec C. 8.7 sec D. 7.0 sec
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Evaluate.If 
and 
, evaluate 
A. 0 B. 4 C. -9 D. 10
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Solve the problem.Determine whether (-2, 6, -1) is a solution of the system -x + 3y + 4z = 16 3x + 2y - z = 7 4x - y + 3z = -17.
A. No B. Yes
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Match the graph to one of the polar equations. 
A. r = 1 B. r = 2 cos ? C. r sin ? = 1 D. r = 2 sin ?
Mathematics