Which of the following characteristics of the set {(0 , 8), (8 , 0), (1 , 6), (6 , 1), (2 , 4), (4 , 2)} make it a function? 
                photoshop1234 [79]             
         
        
Answer:
C
Step-by-step explanation:
For a relation to be a function, the ordered pairs do not repeat any of the x values.  This is Answer C.
 
        
             
        
        
        
Y>3 only rules out B.  B,D,E,F all satisfy 2x<y.  So
ANSWER: D E F
        
             
        
        
        
Answer:
f(u) = 9/5
Step-by-step explanation:
u - 5 = -4(u - 1)      Distribute on the right side
u - 5 = -4u + 4
+4u      +4u            Add 4u to both sides
5u - 5 = 4
     + 5   + 5            Add 5 to both sides
5u = 9                    Divide both sides by 5
u = 9/5
 
        
                    
             
        
        
        
Answer:
A
Step-by-step explanation:
since 36=6² and the other option is not square of integer