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Mathematics 13 Online
OpenStudy (anonymous):

Suppose X,J,Y are points on a number line. Their coordinates are 7,12 and 20 respectively. Which point is between the other two? What is the measure of XY? of JY? IsXJ+JY=XY? Do you have a postulate or theorem that says something about this?

ganeshie8 (ganeshie8):

you can use "segment addition postulate"

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