The data below represent the number of days absent, x, and the final grade, y, for a sample of college students at a large university. Complete parts (a) through (e) below. No. of absences, x 0 1 2 3 4 5 6 7 8 9 0 Final grade, y 88.9 86.0 82.9 80.3 77.3 72.8 63.3 67.5 64.5 61.5 . . . (a) Find the least-squares regression line treating the number of absences, x, as the explanatory variable and the final grade, y, as the response variable. y = x +(]) (Round to three decimal places as needed.)