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If M is the midpoint of −2 and 4 on the number line, what is the value of M?

Answer and explanation

Correct answer: 1

The governing concept is the midpoint property: the midpoint of two numbers a and b is their arithmetic mean, (a + b)/2. Here the endpoints are −2 and 4, so M = (−2 + 4)/2 = 2/2 = 1. Geometrically, 1 is equally far from both endpoints: its distance from −2 is 3 units and its distance from 4 is also 3 units. Therefore option A is correct. Option B results from using only half of the positive endpoint, option C reflects an incorrect sign calculation, and option D is not equidistant from the two given points. Adding signed numbers carefully is important: −2 + 4 equals 2, not −6 or 6.

Related tags

Number-LineMidpointIntegersAverageRepresenting Real Numbers On The Number LinePolynomialsMathematicsClass 10 Mcq

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