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On the number line, point A has coordinate −4.6 and point B has coordinate 2.9. What is the length of AB?

Answer and explanation

Correct answer: 7.5

The distance between two points on a number line is the absolute difference of their coordinates: \(|AB|=|2.9-(-4.6)|=|7.5|=7.5\). Therefore, the correct answer is 7.5. The distractor 6.5 may result from mishandling the subtraction of a negative number. Exam tip: Always take the absolute value when finding distance, since distance cannot be negative.

Related tags

Number LineDistance Between PointsDecimalsAbsolute ValueRepresenting Real Numbers On The Number LinePolynomialsMathematicsClass 10 Mcq

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