Answer:
The length of the line joining points A(1,3) and B(-2,7) can be found using the distance formula: √((x2 - x1)^2 + (y2 - y1)^2). Plugging in the coordinates, we get √((-2 - 1)^2 + (7 - 3)^2) = √(9 + 16) = √25 = 5 units.
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