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If \\(\sqrt{n}\\) lies between 9 and 10 on the number line, which value of n is possible?

Answer and explanation

Correct answer: 91

We have \\(9<\sqrt{n}<10\\). Since both bounds are positive, squaring gives \\(81<n<100\\). The value 91 lies in this interval, so it is possible. The closest distractor is 100, but it is an endpoint and does not satisfy the condition that \\(\sqrt{n}<10\\). Exam tip: when squaring an inequality whose quantities are positive, the inequality signs remain unchanged.

Related tags

Number LinePolynomialsSquare Root InequalitiesReal NumbersInterval ReasoningRepresenting Real Numbers On The Number LineMathematicsClass 10 Mcq

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