Are any of these funtions?
![Are any of these funtions class=](https://us-static.z-dn.net/files/dba/e55b7cb0cc954af10fd62c55f588e539.jpg)
Answer: The first and the fourth option
Step-by-step explanation:
Every input of a function can have only one output.
Option one is a function.
See the attached image as to why option two is not a function.
Option three has two outputs for the input value of "20" meaning it is not a function.
Option four is a function.