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If ( \sqrt{n} ) lies between (8) and (9) on the number line, which value of (n) is possible?

Answer and explanation

Correct answer: (70)

The direct answer is option A, 70. The statement means \\(8<\\sqrt n<9\\). All quantities here are nonnegative, so squaring preserves the order: \\(8^2<n<9^2\\), hence \\(64<n<81\\). Among the choices, 70 lies strictly between 64 and 81, so it is possible. Option A works. Option B, 60, is below 64, so its square root is less than 8. Option C, 81, gives \\(\\sqrt{81}=9\\), but the number must be strictly less than 9. Option D, 100, gives \\(\\sqrt{100}=10\\), outside the interval. The endpoint symbols matter: “between 8 and 9” here excludes both endpoints. Square positive bounds only after checking that the quantities are nonnegative.

Related tags

Number-LineInequalitySquare-Roots

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