Question 1174762


recall:

Interval notation is frequently used to express a set of numbers between two values, a and b.
We basically use two symbols: parentheses ( ) and brackets [ ]:
( ) is used when we have the inequality symbols less than, < , or greater than, >. This means
that specified values for a or b are not included.

[ ] is used when we have the inequality symbols less than or equal to, ≤, or greater than or
equal to, ≥. This means that specified values for a or b are included. 


in your case  the interval  ({{{3}}}, {{{infinity}}}) as an inequality or double inequality will be {{{3 < x < infinity}}}