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If A = -13/2 and B = -3/2, what is the midpoint on the number line?

Answer and explanation

Correct answer: -4

The governing concept is the midpoint formula for two points on a number line: M = (A + B)/2. Substitute the given values carefully: M = [(-13/2) + (-3/2)]/2 = (-16/2)/2 = (-8)/2 = -4. Therefore option B is correct. A geometric check gives the same result: A = -6.5 and B = -1.5, so -4 is 2.5 units from each endpoint. Option A may arise from adding the numerators but forgetting the final division by 2. Option C results from an incorrect arithmetic operation, while option D does not represent the average of the two endpoints. The exact formula establishes a unique midpoint.

Related tags

Number-LineMidpointNegative-FractionsAverageRepresenting Real Numbers On The Number LinePolynomialsMathematicsClass 10 Mcq

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