Answer:
Well, 60 (minutes in an hour) divided by 12 (from the problem) is 5, so you have to multiply that 5 by the 5 from the problem to find that the train is going 25 (5*5) mph. Just double this for two hours, and you result in 50!
Step-by-step explanation:
 
        
             
        
        
        
Answer:
 i think c
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
14x and 3 x 
Step-by-step explanation:
14x and 3 x are like terms. 
This is because they both have 'x'. (They can even be simplified) 
Whereas unlike terms are terms which do not contain the same variable or numerical value. (They cannot be simplified with other terms than its like term)
 
        
             
        
        
        
Answer:
m=-10
Step-by-step explanation:
move -18 to the right, -18 will be 18 and 18-28 is -10.