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Which value is included in the interval (0, 8]?

Answer and explanation

Correct answer: 8

The governing concept is endpoint inclusion in interval notation. The interval (0, 8] represents all real numbers x satisfying 0 < x ≤ 8. The parenthesis at 0 means that zero is excluded, while the square bracket at 8 means that eight is included. Testing the choices makes the result clear: 0 fails because it is not greater than 0; 9 fails because it exceeds the upper bound; and -1 fails because it is less than the lower bound. The value 8 satisfies both conditions, since 0 < 8 and 8 ≤ 8. Therefore option C is correct. This example shows why the distinction between a parenthesis and a square bracket is essential when reading an interval.

Related tags

Linear-InequalitiesInterval-MembershipEndpoint-InclusionNumber-LineRepresentation On Number LineLinear InequalitiesMathematicsClass 11 Mcq

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