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Which description correctly represents (4<x<12) on the number line?

Answer and explanation

Correct answer: Open circles at (4) and (12) with shading between

The inequality \(4<x<12\) means that x must be greater than 4 and less than 12 at the same time. The endpoints 4 and 12 are not allowed because the signs are strict: the statement does not say \(4\le x\) or \(x\le12\). On a number line, an excluded endpoint is shown with an open circle. Every number strictly between the endpoints is included, so that interval is shaded.

Mark an open circle at 4 and another open circle at 12, then shade only the segment between them. Numbers such as 5, 8, and 11 belong to the solution, while 4 and 12 do not. A closed circle would incorrectly include an endpoint, and shading to the right would represent values greater than 4 without the upper restriction. Therefore option C is correct.

Related tags

Linear-InequalitiesOpen-IntervalBetween-Values

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