1/4 is
the answer
................................
 
        
                    
             
        
        
        
Answer:
19y+5
Step-by-step explanation:
Combine like terms look for all the numbers that have y attached and combine them
7y +12y=19y
Look for terms where nothing is attached it's just the number combine them 
6-1=5
Put all together again and you get:
19y+5
 
        
             
        
        
        
Answer: $1300 per month salary
2% commission on all sales
 
        
             
        
        
        
Circumference of whole circle = 

360÷20=18

hence length of arc = 1/3 pi