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What does the interval [7, 7] show on the number line?

Answer and explanation

Correct answer: Only a closed point at 7

The governing concept is the interpretation of a degenerate closed interval. In [7, 7], the lower endpoint and upper endpoint are both 7. The square brackets indicate that the endpoint is included, so the interval means 7 ≤ x ≤ 7. The only real number satisfying both inequalities is x = 7; hence the interval is the singleton set {7}. On a number line, this set is shown by one filled or closed point at 7, with no shaded segment extending to either side. Option A would describe the empty set. Options C and D would describe rightward and leftward rays, respectively, and therefore contain infinitely many numbers rather than just 7. Thus option B is correct.

Related tags

Linear-InequalitiesSingleton-IntervalNumber-LineClosed-EndpointRepresentation On Number LineLinear InequalitiesMathematicsClass 11 Mcq

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