Question

Which numbers are in the domain of the following function?

Answer 1

The domain will be all of ur x values...while the range would be all of ur y values.

Therefore, ur domain is : { 4,5,12,18 }

Answer 2

As we know that a relation is a set of ordered pairs.

Also we know that a function is a relation in which no two different ordered pairs have the same first coordinate.

Hence the given ordered pair $(18,2), (12,9) ,(4,2) ,(5,7)$ represents a function.

Here in the ordered pair the x-coordinate represents the domain of the function, while the y-coordinate represents the range of the function.

Hence the domain of the function represented by the above ordered pair is

$D\epsilon \left \{ 18,12,4,5 \right \}$