a retired biologist withdraws money from a retirement account at a constant rate. 15 months after she starts withdrawing money, she has $785,000 in the account. she has $630,000 in her account 40 months after she starts withdrawing money. let a(t) represent the dollar amount in the account t months after she begins withdrawing money from the account. a. find the linear function that gives a(t), the dollar amount in the account t months after she starts withdrawing money. (8 points) b. how much money is in the account 80 months after she starts withdrawing money? (2 points)