Write the expression as the sum or difference of single logarithms. log18
A. 
log187 - 2 log18x - 2 log18y
B. 
log187 - 2 log18x - log18y
C. 5 log187 - 2 log18x - log185
D. log187 - log18x - log18y
Answer: B
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A. 
B. 
C. 
D. 