You invest $4000 at 4.7% annual interest compounded annually. which gives the balance in your account (a) in terms of the years from now (t)? selected a. a = 0.047 (4000) t answers: a. a = 0.047 (4000) t b. a t+1 = at + 0.047 and a0 = 4000 c. at+1 = at (1.047) and a0 = 4000 d. a = 4000 (1.047t)