Answer: 28 
Step-by-step explanation: you have to add 21 + 7 because your counting up from -7 to 21
 
        
             
        
        
        
Answer:
20ft
Step-by-step explanation:
 
        
                    
             
        
        
        
You would do 2^2 and will come out to 4. Your mixed number is 4. Then you will do 3/4^2 and will come out to 9/12  Your answer is 4 9/12