Answer :

Less than is this sign > and then greater than is < and then equal to is this sign = and then not equal is the equal sign with a line through it

The sign used for "at least" is "greater than or equal to". 

It looks like this : [tex]\ge [/tex]

Here is an example :

[tex]x\quad \in \quad N\quad (x\quad is\quad a\quad Natural\quad number)\\ \\ x\quad is\quad at\quad least\quad 9[/tex]

Can be shown like this :  [tex]x\ge 9[/tex].


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