The function f(x) = 1 + 1.5 ln (x + 1) models the average number of free-throws a basketball player can make consecutively during practice as a function of time, where x is the number of consecutive days the basketball player has practiced for two hours. after how many days of practice can the basketball player make an average of 9 consecutive free throws? (hint: replace f(x) by 9 and solve)