Data on tuition and mid-career salary are collected from a number of universities and colleges. The result of the data collection is the linear model f(x) = - 0.89x + 151000 where a = annual tuition, and f () - average mid-career salary of graduates. 1. What is the slope of this linear model? 2. According to this model, what is the average salary for a graduate of a college or university where the annual tuition is $30,000? HA