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If the points \(A=-7.125\), \(B=-\sqrt{51}\), and \(C=-\frac{57}{8}\) are represented on the number line, which two points will lie at the same position?

Answer and explanation

Correct answer: A and C

\(-\frac{57}{8}=-7.125\), so \(A\) and \(C\) represent the same point on the number line. However, \(-\sqrt{51}\) is different because \(\left(\frac{57}{8}\right)^2=\frac{3249}{64}\neq 51\). Exam tip: To compare a fraction and a decimal, convert the fraction to a decimal or compare their squares when both numbers are negative radicals or rational values.

Related tags

Number LineReal NumbersEquivalent ValuesDecimal Fraction ComparisonRepresenting Real Numbers On The Number LinePolynomialsMathematicsClass 10 Mcq

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