9.00/315 is a way to solve this.
        
                    
             
        
        
        
<span>Selection A is correct</span>
        
             
        
        
        
The <em>echo</em> number 20222022202220222022 is the <em>perfect</em> square of 4496890281.
<h3>What echo number is a perfect square</h3>
An <em>echo</em> number has a <em>perfect</em> square if its square root is also a <em>natural</em> number. After some iterations we found that <em>echo</em> number 20222022202220222022 is a <em>perfect</em> square:

The <em>echo</em> number 20222022202220222022 is the <em>perfect</em> square of 4496890281. 
To learn more on natural numbers, we kindly invite to check this verified question: brainly.com/question/17429689
 
        
             
        
        
        
Answer:
do 70x70=4,900  than do 100 x100=10,000 than add them to gether and you get 10,4900
Step-by-step explanation:
theres 2 sides not just one 
 
        
                    
             
        
        
        
2 significant digits should be represented in the product