Two rival dry cleaners both advertise their prices. Store A's prices are modeled by the expression 20x - 9, where x is the number of items brought in. Store B's prices are modeled by the expression 5(4x+9), where x is the number of items brought in. When do the two stores charge the same rate?

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)

correct answer is c. just did it

step-by-step explanation:

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i think da answer is

d.square root of 3