The equation 9(u – 2) + 1. 5u = 8. 25 models the total miles michael traveled one afternoon while sledding, where u equals the number of hours walking up a hill and (u – 2) equals the number of hours sledding down the hill. Which is the value of u? u = 0. 25 u = 0. 75 u = 1. 1 u = 2. 5.