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If the value changes from fraction1 (F1) to fraction 2 (F2), then the percentage change is 100*(F2/F1 - 1) provided F1 > 0. If F1 is 0 then the value is not defined, and if F1 <0 you get nonsense results.
absolute value of 8 is 8.
The ratio of Xe and F2 is 1:1
I suppose you mean a parabola
Linear