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Answers and rating deltas for

Why isn't this php math code working

Author Votes Δ
n00dl3 1 +4.07
dieBeiden 0 -0.83
Yinka 0 -0.69
Viral 0 -0.82
Vesper 0 -0.08
Alfwed 0 -1.09
Last visited: Nov 10, 2015, 5:58:55 PM