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yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value

this may not be at all, but i use the same website you're using for school, and if i'm stuck doing one of these i try to look for it on the section.

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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step-by-step explanation: easy math