Find the solutions to the system of equations by the addition method.0.8x + 6y = 51.2-0.1x + 0.4y = 2.8
A. (4, 8)
B. (3, 9)
C. (-4, -8)
D. (4, 9)
Answer: A
Mathematics
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Find the volume of the solid generated by revolving the region about the given line.The region bounded above by the line 
, below by the curve 
, on the left by the line 
, and on the right by the line x = 0.5, about the line 
A. 54? - 144 B. 54? C. 18? D. 108? - 72
Mathematics
Simplify.
A. -3x11 B. 3x11 C. 3x7 D. -3x7
Mathematics
Perform the indicated operation.(14x + 12) - (-4x2 - 7x + 12)
A. 4x2 - 21x B. 4x2 + 21x C. 4x2 + 21x - 24 D. -4x2 + 7x + 24
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Graph the system of linear inequalities in two variables.
A. 
B. 
C. 
D. 
Mathematics