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What is the inequality form of the interval (4,∞)?

Answer and explanation

Correct answer: x>4

Interval notation describes which real numbers belong to a set. In
(4,\infty), the round parenthesis at 4 means that 4 is not included. The symbol \(\infty\) indicates that the interval continues without an upper endpoint, so the set contains all numbers to the right of 4 on the number line. Therefore, every allowed value is greater than 4, not equal to 4.

To express this in inequality form, compare x with the left endpoint: \(x>4\). For example, 4.1, 5, and 100 belong to the interval, while 4 does not. A closed endpoint would use a square bracket and would allow equality, giving \(x\ge4\), but that is not the notation shown here. Thus option B correctly translates the interval.

Related tags

Interval NotationLinear InequalitiesOpen IntervalIntroduction To InequalitiesMathematicsClass 11 Mcq

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