Lumos StepUp - SBAC Online Practice and Assessments - Grade 11 Mathematics Use coordinates to compute perimeters of polygons

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A directed line segment is a line segment from one point to another point in the coordinate plane. When using directed line segments, pay close attention to the beginning and endpoints of the line.Point M is the midpoint of $$\overline{CD}.$$ If CM = 4x -1 and DM = 2x + 7, what is the length of $$\overline{CD}?$$

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