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What is the correct number-line result of ( ( -4,3]\cap[3,9) )?

Answer and explanation

Correct answer: Only a closed dot at ( 3 )

The direct answer is option C: only the closed point 3. An intersection contains numbers that belong to both intervals. In \((-4,3]\), numbers are greater than -4 and up to and including 3. In \([3,9)\), numbers start at and include 3, then go below 9. The only common number is 3, and both intervals include it, so the result is \(\{3\}\), shown by a closed dot. Option A, \((-4,9)\), is a broad union-like interval and includes numbers belonging to only one interval. Option B, \((3,9)\), excludes 3 and contains numbers not in the first interval. Option C is correct. Option D is wrong because the intersection is not empty. Memory cue: for intersection, keep the overlap; when endpoints meet and both brackets are square, keep the endpoint.

Related tags

Linear-InequalitiesSingletonIntersection

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