The expression that represents the cost of y books is 12y + 3.
Given that, 
- The charge for the first copy of the book is $15.
- For each extra copy, the charge is $12.
- Here we assume the number of books be y.
Now based on the above information, the expression should be 
= 12y  + (15 - 12)
= 12y + 3
Therefore we can conclude that option F is correct. 
Learn more: brainly.com/question/13910351
 
        
             
        
        
        
Answer:
142.85
Step-by-step explanation:
1000 divided by 7 
 
        
             
        
        
        
Answer:
-6
Step-by-step explanation:
 
        
             
        
        
        
Answer:
step one needs to be fixed... you are supposed to subtract 10 from both sides of the equation.
Step-by-step explanation:
STEP 1: Move all terms not containing n to the right side of the equation.

STEP 2: Divide each term by 2 and simplify.
