<span>Last
year, the average math SAT score for students at one school was 475. The
headmaster then introduced a new teaching method hoping to improve scores. This
year, the mean math SAT score for a sample of students was 491. The headmaster
concluded that the new teaching method produces higher SAT scores. The problem
with reporting results this way is voluntary response. The information of how
the teaching method isnot mentioned.</span>
 
        
             
        
        
        
Answer:
The value of y is 8.
Step-by-step explanation:
In order to find the value of y, you have to put in x = 0 into the equation :

Let x = 0,


 
        
             
        
        
        
The square root of 45 is simplified to 3 root 5. Rounded in decimal form, 6.708
        
                    
             
        
        
        
This looks like an incomplete answer to me... 
I cannot see any diagram or window or opening, or any lines that indicate they are line AC or BD.