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What does the interval (8, 8) represent on the number line?

Answer and explanation

Correct answer: The empty set

The open interval (8, 8) is defined as the set of real numbers x satisfying 8 < x < 8. These two strict inequalities cannot be true at the same time, because a number cannot be both greater than 8 and less than 8. The endpoints are identical, so there is no distance or region between them on the number line. Moreover, the round brackets exclude the endpoint 8 itself, so even 8 is not included. Thus the interval contains no real number and is represented by the empty set, written as ∅. Option A is incorrect because 8 is excluded; option B includes only numbers to the right of 8; and option D includes every real number. Therefore option C is correct.

Related tags

Linear-InequalitiesEmpty-SetNumber-LineInterval-NotationRepresentation On Number LineLinear InequalitiesMathematicsClass 11 Mcq

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