Answer:
The 3rd and 4th option 
Explanation: 
A function only works when the input (x) only has one output (y). 
The first, second, and the last option has the input has two or more outputs.
Fun Fact: 
It is okay for the outputs to have more then in input, but not okay for the input to have more then one output.
I hope this help and have a nice day :)
        
             
        
        
        
Answer:
-0.555
Step-by-step explanation:
-2/3÷12
=-2/3÷12×3/1×3
=-2/3÷36/3
=-2/3×3/36
=-2/36
=-0.0555
I got this answer but don't know how did you got -8?!
 
        
             
        
        
        
XD no sé que decir E=mc2 lo siento.
 
        
             
        
        
        
Answer:
x=-1 y=1/2
Step-by-step explanation:
do you need the step by step?
 
        
             
        
        
        
The square root of 16 is 4