Assuming all variables are positive, use properties of logarithms to write the expression as a sum or difference of logarithms or multiples of logarithms.log7 
A. log7 19 - log7 s - log7 r
B. 2 log7 19 - 2 log7 s - log7 2
C. 
log7 19 - 2 log7 s - log7 r
D. 
log7 19 - 2 log7 s - 2 log7 r
Answer: C
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A. 
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C. 
D. 
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