1. 6units
2. (4, -1) cuz u make y negative like from (-1, 1) to (-1, -1)
3. fourth corner is (5, 7) cuz u add 4 to y since -1 to 3 is +4. and for the x coordinates, -2 to 5 is 7. the side lengths are a 4 by 7 rectangle, so 4+4+7+7=22units cuz ur finding the perimeter