A. would have the highest pitch because the sound vibration are close together and it would also be the fastest. B is incorrect because the sound waves are very which would give it a deeper voice and it would be the slowest 
Hope this helps
        
             
        
        
        
Answer:
Y <= 1
Step-by-step explanation:
This is because it is a solid line and a filled point on the top line, the bottom line is irrelevant for this question
 
        
                    
             
        
        
        
Answer:
Step-by-step explanation:
Connecting any point of original figure with the same of the image
For example point C with C'
The line goes through the origin (0, 0)
<u>And the coordinates changed as:</u>
It means the rotation is 180°
 
        
             
        
        
        
7 goes into 63 9 times so 6/7 you would take away one 9 so it would be 6 times 9 which is equal to 54
Answer: 54 students