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Which interval represents the inequality (2<x\leq 7)?

Answer and explanation

Correct answer: ( (2,7] )

Direct answer: option B, (2,7]. Interval notation records inclusion at each endpoint. The inequality 2<x says x is greater than 2, so 2 is excluded and we use a round, open bracket at the left. The inequality x≤7 says x may equal 7, so 7 is included and we use a square, closed bracket at the right. Together this is (2,7]. Option A, [2,7], incorrectly includes 2. Option C, [2,7), includes 2 and excludes 7, so both endpoint decisions are wrong. Option D, (2,7), correctly excludes 2 but incorrectly excludes 7. On a number line, draw an open circle at 2, a closed circle at 7, and shade between them. The bracket type is determined by the inequality sign.

Related tags

Interval NotationStrict InequalityClosed Endpoint

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