17 11 9 and 7
Remember that the third side must be greater than 5 and less than 19.
        
                    
             
        
        
        
Answer:
closest answer = 81
Step-by-step explanation:
81/27 = 3
81/30= 2.7
81/45 = 1.8
 
        
             
        
        
        
The total cost of the book would be:
12.50* 0.8= 10
The total cost of the book would be $10.00
        
                    
             
        
        
        
The greatest number of friends who can receive a necklace is 6. The reason why is because 6 is the greatest common factor of 72 and 42. 
Each friend will have 12 blue beads and 7 red beads. If you divide 6 (GCF) with both numbers you get 12 and 7.
Hope this helps :3