Write as the sum and/or difference of logarithms. Express powers as factors. log7
A. 
log7r ? 
log7s ÷ 2log7u
B. 2log7r + 5log7s - 2log7u
C. 
log7r + 
log7s - 
log7u
D. 
log7r + 
log7s - 2log7u
Answer: D
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