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If x belongs to the interval (-∞, ∞), what will be shaded on the number line?

Answer and explanation

Correct answer: The entire number line

The interval (-∞, ∞) is the standard interval notation for the set of all real numbers. Infinity is not an endpoint that can be included or excluded like an ordinary number; the notation simply indicates that the interval extends without bound in both directions. Consequently, every real-number point on the number line satisfies x ∈ (-∞, ∞), so the complete number line must be shaded. Option A would represent only numbers extending toward negative infinity, and option B would represent only numbers extending toward positive infinity. Option D would represent an empty set, which this interval certainly is not. Hence option C is correct.

Related tags

Linear-InequalitiesNumber-LineReal-NumbersRepresentation On Number LineLinear InequalitiesMathematicsClass 11 Mcq

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