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If \(A=-6.25\), \(B=-\sqrt{39}\), and \(C=-\frac{25}{4}\), which two of the points \(A\), \(B\), and \(C\) represent the same real number on the number line?

Answer and explanation

Correct answer: \(A\) and \(C\)

\(C=-\frac{25}{4}=-(25\div 4)=-6.25\), so \(A=C\) and both points represent the same position on the number line. \(B=-\sqrt{39}\) is different because \(\sqrt{39}\neq 6.25\); in fact, \(6.25^2=39.0625\), not \(39\). Exam tip: Convert a fraction to decimal form when comparing it with a terminating decimal.

Related tags

PolynomialsNumber LineReal NumbersEquivalent ValuesFraction-Decimal ConversionRepresenting Real Numbers On The Number LineMathematicsClass 10 Mcq

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