Answer:
see image
Step-by-step explanation:
 
        
             
        
        
        
the height of the trapezoid of 5, i think.
my work: 
i used this formula: 2 x a + b / A
so, you plug in what you know.
2 x 8+6 / 35 = 5
 
        
             
        
        
        
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
 
        
             
        
        
        
Answer:44
Step-by-step explanation:44
 
        
                    
             
        
        
        
Rounding the answer is 100.