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On a number line, Reema placed \(\sqrt{7}\) to the right of 2.7 because she claimed that \(2.7^2<7\). Which is the correct analysis of her reasoning?

Answer and explanation

Correct answer: Reema’s conclusion is wrong because \(2.7^2=7.29>7\); therefore, \(\sqrt{7}<2.7\).

Reema squared 2.7 incorrectly. Since \(2.7^2=7.29\), which is greater than 7, the positive square root \(\sqrt{7}\) must be less than 2.7. Exam tip: compare squares of nearby positive decimals to locate a square root.

Related tags

Number LineIrrational NumbersSquare RootsDecimal ComparisonError AnalysisNumber SystemsMathematicsClass 9 Mcq

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