Please explain the excel function used

Question 2: a) Assume that you have been saving 15% of your salary of $60,000 for retirement over the past 15 years. Initially, you planned to invest all of your money in medium-risk stock mutual funds which have an annual, inflation-adjusted, return of 9%. How much money have you saved up so far? Show your work. (11 points) N 1/Y PV PMT FV b) Assume that you want to have $1.5 million saved up the day you retire by investing in the same medium-risk stock mutual funds which have an annual, inflation-adjusted, return of 9%. If you have 20 years left until retirement, are you on track? Show your work. (11 points) N 1/Y PV PMT FV