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If (M) and (N) are at (-6.2) and (-1.8) respectively on the number line, what is the length of (MN)?

Answer and explanation

Correct answer: 4.4

The distance between two points on a number line is the absolute value of the difference of their coordinates. Thus, \(MN=|-1.8-(-6.2)|=|-1.8+6.2|=4.4\). Therefore, 4.4 is correct. A value such as 3.4 can result from handling the negative signs incorrectly. Exam tip: distance or length is always positive.

Related tags

Number LineDistance Between PointsNegative DecimalsAbsolute ValueNumber SystemsMathematicsClass 9 Mcq

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