Monthly normal rainfall data (x, y) for Portland, Oregon, are (4,2.47), (7,0.58), and (8,1.07), where x represents time in months (with x=1 representing January) and y represents rainfall in inches. Find the values of a, b, and c rounded to 2 decimal places such that the equation y=ax2+bx+c models this data. According to your model, how much rain should Portland expect during September?