PLEASE HELP ME WITH THIS

Step-by-step explanation:

The last one: {(-2,-2), (0,0), (-4,-4), (0,-2)}

Step-by-step explanation:

In a function, the x value should not repeat.

The only option that has 2 of the same x values is the last one.

Another way to do this is the vertical line test.

Graph all points, and if two points are on the same vertical line, it's not a function. If all points are on different vertical lines, it is a function.

Hope this helps you understand! :D

answer:   b

step-by-step explanation:

x2 = 16

x can not be a negative number because 16 is positive

the only answer would be positive 8