Answer:
This particular equation cannot be solved using synthetic division as you can only use synthetic division when divided by a linear factor.
Step-by-step explanation:
 
        
             
        
        
        
Answer:
Radius: 4.2 cm
Diameter: 8.4 cm
Step-by-step explanation:
Radius: The number that is half the circle.
Diameter: The radius times 2
 
        
                    
             
        
        
        
A = bh/2
2a = bh 
2a/b = h
h = 2a/b