Subtraction 
multiplication 
yayyyyyyyyyyy
        
                    
             
        
        
        
The 'x' in x^2-7x-30=0 is 4.
        
             
        
        
        
Answer:
-3 +8a
Step-by-step explanation:
(3-8a) *(-1)
Distribute
3*-1  -8a*-1
-3 +8a
 
        
             
        
        
        
49/100 is equal to .49 in decimal form, and now we just need to add the 4 wholes.  This is equal to 4.49
        
                    
             
        
        
        
4.8, I hope this helps you, I answered this earlier. :)