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In the number-line representation of [-3,4)∪(4,10], what happens at 4?

Answer and explanation

Correct answer: There will be an open hole at 4

The governing concept is endpoint inclusion in a union of intervals. The first interval, [-3,4), contains values up to but not including 4. The second interval, (4,10], begins just after 4 and also excludes 4. Although the number line is shaded on both sides of 4, neither interval contains the point itself. Therefore the graph has an open hole at 4, making option B correct. A closed dot would mean that 4 belongs to at least one interval, which is false here. Options C and D are incomplete because shading occurs on both sides, not only on one side.

Related tags

Linear-InequalitiesUnionEndpoint-InclusionRepresentation On Number LineLinear InequalitiesMathematicsClass 11 Mcq

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