Answer:
2nd one.
Step-by-step explanation:
 
        
             
        
        
        
Answer:
7x+3
Step-by-step explanation:
The only like terms are 5x and 2x
5+2=7 
 
        
                    
             
        
        
        
A) -2 
Explanation on pictures 
For step 3 where it says Simplify the only thing it has is -2
 
        
        
        
Answer = 24
Reason
4/5 is the same as 24/30
Notice the denominator 5 changes to 30
In order to do that we multiply 5 x 6
So we do the same to the numerator 
Multiply 4 x 6 =24
        
                    
             
        
        
        
The answer to this specific formula is 2