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If M is the midpoint of -1.5 and 4.5 on the number line, what is the value of M?

Answer and explanation

Correct answer: 1.5

The governing concept is the midpoint formula for two points on a number line. If the endpoints are a and b, their midpoint is M=(a+b)/2, because this average is equally distant from both endpoints. Substituting a=-1.5 and b=4.5 gives M=(-1.5+4.5)/2=3/2=1.5. The result can also be checked geometrically: the distance from -1.5 to 1.5 is 3 units, and the distance from 1.5 to 4.5 is also 3 units. Therefore option A is correct. Option B is the total of the two values after an incorrect operation, option C is not their average, and option D does not divide the interval into two equal parts.

Related tags

Number-LineMidpointReal-NumbersArithmetic-MeanRepresenting Real Numbers On The Number LinePolynomialsMathematicsClass 10 Mcq

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