The set of real numbers that are at least 2 and at most 9 is represented by the inequality 2 ≤ x ≤ 9. ;
The set of all real numbers that are at least 2 and at most 9 can be expressed as [2, 9], denoting a closed interval that includes both 2 and 9. ;
The set of all real numbers that are at least 2 and at most 9 can be expressed as the closed interval [2, 9], which includes both endpoints. This is the range of numbers satisfying the condition 2 ≤ x ≤ 9. Therefore, any number within this range is part of the set.
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