Devonte used the change of base formula to approximate the log base 8 of 25 Which expression did Devonte use?

The change of base formula is log_b(a) = log(a) / log(b), using the same logarithm base in the numerator and denominator. For log base 8 of 25, this gives log 25 divided by log 8, which is choice C.

AI-written and checked against the verified answer.