Using the change-of-base formula, which of the following is equivalent to thelogarithmic expression below?

SOLUTION:
We use the rule;
[tex]\frac{log_ap}{log_aq}=log_qp[/tex]Looking at the question;
[tex]log_621=\frac{log_{10}21}{log_{10}6}[/tex]Thus, the answer is
[tex]\frac{log_{10}21}{log_{10}6}[/tex]Option C