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$f(x)=-0.0038400x^2+15.236x-15,103$ The model shown gives the predicted average Arctic sea ice area $f(x)$, in millions of square kilometers, for September of each year $x$, where $x$ represents a year and $1979\le x\le 2012$. Based on the model, what is the positive difference, in millions of square kilometers, between the predicted average Arctic sea ice area for September of the year 1991 and the predicted average Arctic sea ice area for September of the year 1992? (Round your answer to the nearest thousandth.)

1

0.059

2

.059