Solve the equation exactly in the complex number system.x3 + 125 = 0
A. x = 5, x = 
± 
B. x = - 
, x = 
± 
C. x = -5, x = 
± 
D. x = -5, x = 
+ 
, x = - 
- 
Answer: C
Mathematics
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A. 
B. 
C. 
D. 
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A. 
B. 
C. 
D. 
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Pencils are stacked in a triangular shaped pile with one pencil on the top row, two pencils on the second row, etc. If there is a total of 15 pencils, how many are on the bottom row?
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