The libraries in four counties assess late fees for overdue videos by using linear functions. each library charges a base amount plus a penalty for the number of weeks that the video is overdue. the equations that model the cost, y, in dollars for videos that are x weeks overdue are shown in the table.

Cumberland and Lincoln

A. Cumberland and Lincoln

for finding the midpoint of any given 2 pair of points simply add the respective x coordinates with other x coordinate and the y coordinate with other y coordinate and divide them by 2

in your question it will be :

(3+1)/2 for the x coordinate of mid point i.e 2

[8+(-4)]/2 for the y coordinate of midpoint i.e 2

so coordinates of mid point of points (3,8) and (1,-4) will be (2,2)

5x+10 is the correct one

hope this