Please show formulas so I can understand! (possibly a timeline?)

2. (4 points) You must use the formulas and then verify your answer with a financial calculator: Show all your entries with the calculator. (i.e. i/yr =?, cf - ?......) Your friend, Alyssa, has a son, Bill, who just turned 13 years old. Bill is planning on starting college on his 18th birthday. Alyssa has determined she will need $23,000, $25,000, $26,000 and $27,000 for his freshman, sophomore, junior, and senior years of college. She plans on making these amounts available to her son at the beginning of each of these years. Alyssa currently has $15,000 saved and would like to make monthly deposits for 5 years at the end of each month until he turns 18. She wants the account to be worth enough just to pay for the college expenses listed above. If she can earn 8% APR on her deposits until age 18, and assuming that any balance remaining in the account will only earn 2% APR (with annual compounding) after he turns 18, how much will Alyssa have to deposit each month to provide for her son's education