Multiply, and then simplify if possible. Assume all variables represent positive real numbers.(
+ -9)(
+ 5
- 7)
A. 
- 16
- 45
+ 5
+ 63
B. 5
+ 
- 16
- 45
+ 63
C. -16
- 45
+ 5
+ 
+ 63
D. 5
- 15
- 45
+ 63
Answer: B
Mathematics
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