How many sides does a square have?

Option 1 , 2 and 4 is defined as a function.

And, for 1 relation;

The domain of relation = {2, -3, 4, 1}

And, Range of relation = {6, 9 ,10}

For 2 relation;

The domain of relation= {1, 2, 3, 4}

The range of relation = {3}

For 4 relation ;

The domain of the relation = {-2, -1, 0, 1}

The range of the relation = {4, 1, 0}

What is function?

A function is defined as a relation between a set of input having only one output.

Now,

The relation is;

1) {(2,6), (-3,6), (4,9), (1,10)}

Hence, The domain of relation = {2, -3, 4, 1}

And, Range of relation = {6, 9 ,10}

Clearly, Each input (domain) has only one output (range)

Hence, The given relation is function.

For,The relation;

2) {(1,3), (2,3), (3,3), (4,3)}

The domain of relation= {1, 2, 3, 4}

The range of relation = {3}

Clearly,  Each input (domain) has only one output (range).

Hence, The given relation is function.

For, The function;

3) {(-2,4), (-2,6), (0,3), (3,7)}

Clearly, -2 has two image 4 and 6.

So, This relation is not a function.

For, The function;

4) {(-2,4), (-1,1), (0,0), (1,1)}

The domain of the relation = {-2, -1, 0, 1}

The range of the relation = {4, 1, 0}

Clearly, Each input (domain) has only one output (range).

Hence, This relation is a function.

Therefore,

Option 1 , 2 and 4 is defined as a function.

And, for 1 relation;

The domain of relation = {2, -3, 4, 1}

And, Range of relation = {6, 9 ,10}

For 2 relation;

The domain of relation= {1, 2, 3, 4}

The range of relation = {3}

For 4 relation ;

The domain of the relation = {-2, -1, 0, 1}

The range of the relation = {4, 1, 0}

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