Which of the following expression is true for a number greater than -2 but less than 7?

{x|-2 < x < 7}

{x|-2 > x > 7}

{x|-2 ≥ x ≥ 7}

None of these

The expression that represents "a number greater than -2 but less than 7" is:

{x | -2 < x < 7}

This notation correctly indicates x is between -2 and 7, excluding both -2 and 7.