Find the midpoint between (31, 7) and (–17, 19).

To find a midpoint, average the two x-coordinates and average the two y-coordinates. The x-coordinate is (31 + (−17)) ÷ 2 = 7, and the y-coordinate is (7 + 19) ÷ 2 = 13. The midpoint is (7, 13), choice A.

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