The function that represents the total yearly cost is =$1800 + $300n.
The total cost of the health insurance can be modelled as: fixed cost + (variable cost x number of doctor visits)
$150 + $25n
Fixed cost is the cost that is constant. It does not depend on any other factor. Variable cost is the cost that varies with the number of doctor visits. The higher the doctor visits, the higher the variable cost.
The yearly cost = 12 x ($150 + $25n)
= $1800 + $300n
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