It would normally be called 1unit, though the distance is not a constant.
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An axis.
Since it is called a distance time graph I don't think it is too wild a guess to suggest that they might be "distance" and "time"!
cyclomatic number of a graph is e.n+1 where e is number of edge of graph and n is number of node in graoh g
The dependent variable.
The absolute value of the difference.