Which of these tables represents a function

A is the answer. because there is no repeating input

A

Step-by-step explanation: If there is two or more of the same number on the X value. then it isn't a function. If this was drawn on a graph then you could perform a vertical line test. If a vertical line hit's a point below it then it isn't a function.

e

step-by-step explanation:

an equation by definition has to have two or more variables (x and 2 in this case)

there would only be 50 odd numbers between 1 and 100 so therefor there would be 50 even so that would only be 50 odd numbers.