Can someone help me with this math homework please!

option 3. (4, -2)

Step-by-step explanation:

For a relation to be a function there should be exactly one output value for a given input.

In the given relation :-

4 has 2 outputs, -2 and 2, so if we remove the pair (4, -2) 4 will have only one output value ,i. e., 2. And hence the relation will be a function.

So the answer is option 3. (4, -2)

18a

step-by-step explanation:

simply because it is. it's the highest common factor

answer: -2+√x,-2-√x

i hope this , i don't know if you're looking for a pair or not.