Answer:
Domain stays the same while the range changes
Step-by-step explanation:
While reflecting cross x-axis, the x coordinates remains the same while the y-coordinate changes to its opposite. 
=> x- coordinate = Domain
=> y-coordinate = Range
 
        
                    
             
        
        
        
If you're looking for the angle it is a 30, 60, 90, but if you're looking for the length of the hypotenuse it's 5
        
                    
             
        
        
        
15-9= 6 the difference is 6 people. i hope this is what you were looking for.