Select all the correct answers. Which relations are functions?

x
y
-2
-4
-2 -6
0
-8
2
-10

x
y
0
4
10 5
20
6
10
7

x
y
2
-10
1 -20
0
-10
-1
-20

x
y
2.5
0
3.5 4
4.5
8
6.5
12

x
y
-10
4
-20 5
0
6
-10
7

The third and fourth ones are functions.

Step-by-step explanation:

How that helped.

the answer is a

step-by-step explanation:

because if you put 1 in to the square root of x it equals 300.

answer: when you burn wood, the carbon reacts with the oxygen in the air to create ash and smoke. that is a permanent change you cannot undo that.

step-by-step explanation: