4c+3=15 
You need to get rid of the 3 
So you minus it from each side so you 
4c=12
12/4=3
So c =3
        
                    
             
        
        
        
Answer:
the square root of 36 is 6, and for 64 it is 8
Step-by-step explanation:
 
        
                    
             
        
        
        
19 is the answer since 2 to the 2nd power is 4 5×4=20 -1 to the 2nd power is -1
20-1=19
        
                    
             
        
        
        
Pretty long why? don't get yourself banned on purpose or break the code of conduct please young ppl are on here