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If the number line has a closed circle at -3, an open circle at 3, and shading between them, what is the interval?

Answer and explanation

Correct answer: [-3, 3)

The governing concept is translating endpoint symbols and shading into interval notation. A closed circle at -3 means that -3 is included, so the left endpoint requires a square bracket. An open circle at 3 means that 3 is excluded, so the right endpoint requires a parenthesis. Shading between the two marked points means that every real number between them is included. The solution is therefore -3 ≤ x < 3, written as the interval [-3, 3). Hence option D is correct. Option A excludes both endpoints, option B includes both, and option C excludes -3 but includes 3. Each of those alternatives contradicts at least one of the endpoint markings shown on the number line.

Related tags

Linear-InequalitiesInterval-NotationOpen-And-Closed-EndpointsNumber-LineRepresentation On Number LineLinear InequalitiesMathematicsClass 11 Mcq

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