Answer:
4x⁵z8
Step-by-step explanation:
 
        
             
        
        
        
The circumference of a circle is equal to the diameter times pi. So, let's look at what happens if you double the radius of a circle -- say from 2 to 4. The area will go from 12.56 to 50.24. This means that it has quadrupled.
 
        
             
        
        
        
Answer: 11
Step-by-step explanation:
 
        
             
        
        
        
For every hour they studied their grade will go up by 9.6 points
        
             
        
        
        
well because he did not do it