J= r + 9 because since jessica rode 9 more miles than roger, you add 9 miles to rogers mileage.
Answer from: Quest
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)
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