Answer:
Fourth option.
Step-by-step explanation:
The change of base formula is if we have a logarithm in the form of
[tex] log_{b}(a) [/tex]
we can rewrite this as
[tex] \frac{ log_{c}(a) }{ log_{c}(b) } [/tex]
w
[tex] \frac{ log_{9}(15) }{ log_{9}(7) } [/tex]
The fourth option is the answer
