Answer
Average annual cost = 400 + 180/x Explanation: We begin with the formula y = mx + b. Here, b represents the initial expenses, which are the one-time costs of $180. The slope, m, corresponds to the ongoing yearly costs, which is $400. The total cost can be expressed as Costs = 400x + 180. To calculate the average cost per year, we divide this total by x, resulting in Average annual cost = (400x + 180)/x = 400 + 180/x.
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