You have to line them up for example 1 is in a straight line and so is 3 and 5 you can choose between 3 and five but what about the middle 4.
        
             
        
        
        
The LCM of 3 and 4 is 12.
I hope this helps and have a good night! :D
        
                    
             
        
        
        
B.)
I can tell because the sin func starts from the top at 0 (if sin is positive)
        
             
        
        
        
Is there more to this question? If so, please revise your question so all your smart Brainly friends can help you!
        
             
        
        
        
width=2
length= 4
explanation in the attached picture