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A map of the town that Annie and Barbara live in can be represented by the Cartesian plane. Annie is located at $(3,5)$ and Barbara says she is located at $(-6,2)$. They agree to meet the midpoint of their current locations. However, it turns out that Barbara read the map wrong, and she is actually at $(-10,4)$. What is the positive difference in the X-coordinates of where they agreed to meet and where they should actually meet? 

 Jan 1, 2021
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Using the midpoint formula, you can see that the midpoint of these two locations are (-1.5,2.5), then the difference of the x coordinates is simply -10-(-1.5), which is -11.5, and absolute value is 11.5.

 Jan 1, 2021

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