Solve the system of equations by Gauss-Jordan elimination.
A. {(0, 0, 9)}
B. {(2z + 4, -3z + 5, z)}
C. {(2z - 4, -3z - 5, z)}
D. ?
Answer: B
Mathematics
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Evaluate the expression.(-7)2
A. -14 B. -49 C. 14 D. 49
Mathematics
Perform the addition. Express your answer in simplest form.
+ 
A. 
B. 7
C. 
D. 
Mathematics
Solve the problem.A cross-section of an irrigation canal is a parabola. If the surface of the water is 48 ft wide and the canal is 
deep at the center, how deep is it 24 ft from the edge?
A. 7 ft B. 1.8 ft C. 5.2 ft D. 0 ft
Mathematics
Perform the indicated operation.
- 
A. - 
B. 
C. 
D. 
Mathematics