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If a representation has a closed circle at b, what is the correct meaning?

Answer and explanation

Correct answer: b is included in the solution

The governing concept is endpoint inclusion on a number line. A closed, or filled, circle means that the boundary value itself belongs to the solution set. This notation is used with inclusive inequalities such as x ≤ b or x ≥ b. For example, x ≤ b contains b as well as every number smaller than b, so the point b must be filled. An open circle would instead indicate that b is excluded, as in x < b or x > b. The direction of shading tells which side is selected, but the closed circle specifically communicates inclusion. Therefore option A is correct; option B describes an open circle, while options C and D do not follow merely from the presence of a closed endpoint.

Related tags

Linear-InequalitiesClosed-CircleNumber-LineRepresentation On Number LineLinear InequalitiesMathematicsClass 11 Mcq

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