(1/(40.2008-31.7325))*(integral from 31.7325 to 40.2008, -0.000306757 x^3 + 0.0316499 x^2 - 0.981467 x + 12.8474-(-0.000320243 x^3 + 0.034155 x^2 - 1.11095 x + 15.054))