Express as a difference of logarithms.log13 
A. log13 16 - log13 9
B. log13 9 + log13 9
C. log13 9 ÷ log13 16
D. log13 9 - log13 16
Answer: D
Mathematics
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C. - 
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A. [-4, ?)
B. (-?, ?)
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A. {0} B. {42} C. ? D. {all real numbers}
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A. (-?, -2] ? 
B. 
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