-4+x=9.5
x=13.5
The student might have subtracted 9.5-4, which results in the answer 5.5. The correct answer is 13.5.
        
                    
             
        
        
        
Answer:

Step-by-step explanation:
The blue line represent the full line length. 
We can add the parted black segments together and set it equal to the line.





 
        
             
        
        
        
Answer:
Student A Mean: 697/8=87.125
Student A Mean Absolute Deviation: 7.1563
Student B Mean: 756/9=84
Student B Mean Absolute Deviation: 7.3333
 
        
             
        
        
        
Answer: 1 and 1/4
Step-by-step explanation:
 
        
             
        
        
        
When given two points, use point-slope form
When given a point and the intercept, use slope-intercept form.
When given a point and the slope, use point slope form.