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If (P=-1.25) and (Q=2.75) on the number line, which point is the midpoint of (PQ)?

Answer and explanation

Correct answer: 0.75

The coordinate of the midpoint is the average of the coordinates of the two endpoints. Thus, \(\frac{-1.25+2.75}{2}=\frac{1.50}{2}=0.75\). Therefore, option B is correct. Option A, 0.50, results from an arithmetic error in adding or averaging the coordinates. Exam tip: Add the endpoint coordinates and divide the sum by 2 to find the midpoint.

Related tags

Number LineMidpointDecimalsCoordinate GeometryNumber SystemsMathematicsClass 9 Mcq

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