Answer:
log 21 - log 6 = log 7/2
5 5 5
Explanation:
The formula for the log of a quotient a/b is log a - log b.
Thus, log 21 - log 6 = log 21/6, or log 7/2
In your case the logs are to the base 5, so the actual answer would be:
log 21 - log 6 = log 7/2
5 5 5