Answer:
72000 miles.
Step-by-step explanation:
Because we know each tire has been on the car for the same number of miles which means 1 tire can travel :4/5*90000 = 72000 miles.
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Step-by-step explanation:
Perhaps you want to solve the equation for the value of x. If so then let us work it out:

The correct answer is 3) $15
It seems that the first row was before the fixed amount was charged.
Days 1 and 2 are in a constant change of 1x and 15y.