The four inequality symbols are,
The example for each one of inequality symbol are,
In this inequality, possible values of x are less than 4 (not including 4). x can takes all the values that are less than 4.
Second inequality,
In this inequality x takes all the value that are greater than 4 (not including 4). x takes all the values more than 4.
Third inequality,
In this inequality x takes all possible values of x less than 4 but also include 4. x can takes all the value less than or equal to 4. In this x can also be equal to 4.
Fourth inequality,
In this inequality x takes all possible value that are more than 4 and equal to 4 (It include 4 also). x can takes all values more than or equal to 4. In this inequality x can also be equal to 4.