Answer:
a. I'm not sure if there's more to the question but I can't answer without knowing how many is the whole class
B. 12 boys
 
        
             
        
        
        
Answer:
I believe a=22
Step-by-step explanation:
a=4+4+4+2+8
a=8+4+2+8
a=12+2+8
a=14+8
a=22
 
        
             
        
        
        
Answer:
630 people
Step-by-step explanation:
Ratios:

 
        
             
        
        
        
Answer:
b and d
Step-by-step explanation:
parallel means go in the exact same direction and if they never ended, they would never touch