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Which of the following is the interval form of the set \(\{x\mid x\leq 8\}\)?

Answer and explanation

Correct answer: \(( -\infty, 8]\)

The inequality \(x\leq 8\) includes 8, so the endpoint 8 must have a closed bracket, \(]\). It also includes every real number less than 8, extending left toward \(-\infty\). Therefore, the interval is \(( -\infty, 8]\). Option B is the closest distractor, but it excludes 8. Exam tip: use a closed bracket when an endpoint is included by \(\leq\) or \(\geq\).

Related tags

Linear InequalitiesInterval NotationSet-Builder NotationNumber LineReal NumbersRepresentation On Number LineMathematicsClass 11 Mcq

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