Solve the system by addition. x + 5y = 20 8x + 4y = -20
A. {(5, 6)}
B. {(-6, 6)}
C. ?
D. {(-5, 5)}
Answer: D
Mathematics
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on the left by the 
and on the right by the line 
Find the volume of the solid generated by revolving the region about the x-axis.
A. ?
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C. - 
D. 2?
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A. 
B. 
C. 
D. 
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