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If the coordinate of a point on the number line is \\(x=\\sqrt{a}\\) and \\(5.2<x<5.3\\), which value of \\(a\\) is possible?

Answer and explanation

Correct answer: 28

Since \\(5.2<x<5.3\\) and both bounds are positive, squaring preserves the inequality: \\(5.2^2<a<5.3^2\\). Thus, \\(27.04<a<28.09\\). Among the given options, only 28 lies in this interval; 26 and 25 are too small, while 30 is too large. Exam tip: when both sides of an inequality are positive, squaring does not reverse its order.

Related tags

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

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