On a number line, point a has a coordinate of −6, and point b has a coordinate of 2. which is the coordinate of point m, the midpoint of ab? a: 4 b: −2 c: 0 d: −3

To solve this, we just need to find the distance between the points A and B in the number line, and then, divide that distance by 2.
Remember that the distance formula between tow point in the number line is: 

From our point we can infer that  and , so lets replace the values:





Now, to find the coordinate of the midpoint, we just need to divide that distance by 2:



We can conclude that the coordinate of the point M, the midpoint of AB, is 4

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