Distance and midpoint

Calculate:

1. Distance between (0, 0) and (3, 4)
2. Distance between (-1, 2) and (2, 6)
3. Midpoint of (2, 5) and (8, 1)
4. Midpoint of (-3, 4) and (5, -2)
5. A line has endpoints (1, 7) and (7, -1). Find its length and midpoint.

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