The answer is 604.235378543
We have the next inequation
8-4x<56
-4x<56-8
-4x<48
-x<48/4
-x<12
x>-12
Solution: x>-12 or (-12,+∞)
About 67 pairs. one shoe is left over. walking; 26 pairs running: about 41 pairs. sorry if im wrong
The coordinates of the fourth vertex are (0,0). I hope this helps!
