Answer:
-83/20
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
12f+49g
Step-by-step explanation:

 
        
                    
             
        
        
        
Answer:
b = 7
Step-by-step explanation:
6 b + 6 = 48
Subtract 6 from each side
6b+6-6 = 48 -6
6b = 42
Divide each side by 6
6b/6 = 42/6
b = 7
 
        
                    
             
        
        
        
Step-by-step explanation:
I believe it is 15...all the numbers can be divided by 15, since 15 is the smallest number it is also the highest common factor only because 30 and 45 can be divided by 15
 .......hope it helps!