I'm pretty sure 10/63 is simplified.
        
                    
             
        
        
        
The top two answers are equivalent, while the bottom one is not. You would use distributive property in the parentheses. If both expressions are the same, they are equivalent
        
             
        
        
        
Answer:
5
Step-by-step explanation:
You first start by finding the acceleration of the problem. 
a=f/m 
Which this case is 45.
The question is asking " How many times greater must it be than A?"
You then divide 
45/9
Your final answer is 5.
 
        
             
        
        
        
 Answer: 99.7%
Step-by-step explanation:
Edg 2020
 
        
             
        
        
        
Answer: 77
Step-by-step explanation: