Help pls thanks so much

9 or 9

Step-by-step explanation:

So when it says he biked 3 ur suppose to add it 3 times then u add the both ones on the top and u get 2 then the answer u get is either 9 or 9

you didn't post any answer choices, so its not 100% clear what your teacher is looking for

however, log(15/7) is equivalent to log(15) - log(7)

i'm using the rule log(x/y) = log(x) - log(y)