The equations that model the cost, y, in dollars for videos that are x weeks overdue is y(x) = c + c' * x
A function can be described as a mathematical expression in which there are two variables , one is dependent and the other is independent.
A function always has a defined domain and range.
It is given in the question that
The libraries in four counties assess late fees for overdue videos by using linear functions.
Each library charges a base amount =$ c
plus a penalty for the number of weeks that the video is overdue = $c' /week
No. of weeks overdue = x
The equation formed will be
Total dollars for videos
y(x) = c + c' * x
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