Answer:
b. 720
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
where are the multiple choice
Step-by-step explanation:
 
        
             
        
        
        
Answer:
he studies his math for 15 hours
Step-by-step explanation:
 
        
             
        
        
        
Answer:
14.93
Step-by-step explanation:
For this problem you need to know distance formula, which is 
d=√(x2-x1)²+(y2-y1)². You'll want to plug in (0,3) and (-2, 9) and go on to plug in all of them at some point. You'll get 6.32 as the distance between (0,3) and (-2, 9), 3.61 as the distance between (-2, 9) and (-4, 6), and 5 as the distance between (-4, 6) and (0, 3). You add them up and get your answer.
 
        
             
        
        
        
$3.25 is the other 1/4. So $3.25 x 4 is $13 (their total). They spent $9.75