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On a number line, -10 is an open dot, -4 is a closed dot, and the region between them is shaded. Which interval is correct?

Answer and explanation

Correct answer: (-10,-4]

The governing concept is translating endpoint marks and shading on a number line into interval notation. An open dot means that the endpoint is excluded from the solution set, whereas a closed dot means that it is included. Since -10 has an open dot, the interval must begin with a parenthesis at -10. Since -4 has a closed dot, the interval must end with a square bracket at -4. The shaded portion includes all numbers between these endpoints, so the set is (-10,-4]. The order is correct because -10 is less than -4. Therefore option B is correct. Option A incorrectly includes -10 and excludes -4; option C excludes both endpoints; and option D includes both. The endpoint symbols, not merely the shaded length, determine the brackets.

Related tags

Linear InequalitiesInterval NotationNumber LineOpen And Closed EndpointsClass 11Representation On Number LineMathematicsClass 11 Mcq

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