Add or subtract, if possible. Assume that all variables represent non-negative values and be sure to simplify your answer.3
- 2
- 
- 5
A. -31
+ 45
B. 31
- 45
C. 31
+ 45
D. -31
- 45
Answer: B
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A. 
B. 
C. - 
D. 
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A. 
B. - 
C. 
D. - 