Part A:
Let's start by setting up the equation. We know that the service station charges an installation fee of $84 and a set price for each new tire. If t represents the price of one tire, then the total cost of four tires and installation can be expressed as:
4t + 84 = 791
Part B:
Now we can solve for t to find the price of one tire:
4t + 84 = 791
4t = 707
t = 176.75
Therefore, the price of one tire is $176.75.