Xian is planning to sell souvenirs at one of the upcoming county fairs. At the Walch County Fair, a vendor's permit would cost $75, and he could expect to pay his seller $9 per hour. At
the Pickaway County Fair, a vendor's permit costs $60, but since the fair is busier and further
away, he would have to pay his seller $11 per hour.

Write a function to describe Xian's total costs for each fair

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choyko:

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take the logarithm of both sides (the base of the log doesn't matter):

apply the exponent property - this says that :

distribute the log terms on both sides:

group like terms together:

divide through both sides by the coefficient on :

you can do some additional rewriting here using the properties of the logarithm to simplify things if you like: