3) (9 points) Use the following regression equation regarding professor salaries for parts (a) - (c). Salary = 55000 + 2280(Years) Note that Years is the number of years a professor has worked at a college, and Salary is the annual salary (in dollars) the professor earns. a) What is the expected salary of a professor who has worked at a college for 15 years? b) Interpret the slope in the context of the data. c) Interpret the intercept in the context of the data. State whether the value is meaningful