Answer:
y = 2.00 + .10x
9.60
Step-by-step explanation:
Let y = the total fine and x = the number of days the book is overdue.
y = 2.00 + .10x
There is a 2.00 if it is overdue + .10 per day for each day
The cost of 1 overdue book at 12 days overdue
y =2.00 +.10*12
y =2+1.20
 = 3.20
She has 3 books that are 12 days overdue
Multiply this by 3
3.20*3 = 9.60