Question 979939
t = number of months
C(t) = total cost at t months


-------------------------------------------------------


The phone costs $86. This is the fixed cost.


The plan costs $116.98 per month. This is the variable cost.


-------------------------------------------------------


Total Cost = (variable cost)*(number of months) + (fixed cost)


C(t) = (116.98)*(t) + (86)


C(t) = 116.98t + 86


-------------------------------------------------------


The total cost equation/function is <font color="red">C(t) = 116.98t + 86</font>