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If the number line has an open circle at 1, a closed circle at 8, and shading between them, what is the interval?

Answer and explanation

Correct answer: (1, 8]

The interval notation is determined independently at each endpoint. An open circle at 1 means that 1 is excluded, so the interval must begin with a parenthesis. A closed circle at 8 means that 8 is included, so the interval must end with a square bracket. Shading between the points means that every number greater than 1 and less than or equal to 8 is selected. Therefore the interval is (1, 8]. Option A includes 1 incorrectly, option B excludes 8 incorrectly, and option D reverses both endpoint symbols. Hence option C is correct.

Related tags

Linear-InequalitiesInterval-NotationMixed-EndpointsRepresentation On Number LineLinear InequalitiesMathematicsClass 11 Mcq

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