Answer:
b. 7+21
Step-by-step explanation:
If you do 1+3=4 and then 4 times 7 that equals 28. When you do 7+21 that equals 28 too. So b is the answer 
 
        
             
        
        
        
Answer:
C) Ken added 19 to both sides of the equation rather than subtracting 19.
Step-by-step explanation:
I Just Took The Test On Edge 
 
        
                    
             
        
        
        
Answer:
(there is no screenshots so i cant take a good guess) I would say A
Step-by-step explanation:
 
        
             
        
        
        
Answer:
20
Step-by-step explanation:
 
        
             
        
        
        
You must connect all the letters to create the shape of a trapezoid