I need help understanding this problem:

2. [-/2.4 Points] DETAILS Eight payments of 1 are made consecutively with the first being at time 5 and the last being at time 12. Assume that the account has an effective rate of i. Which of these give the value of the annuity at time 17 Select all that apply Choice Formula Choice Formula A: E: B: . F: C: G: D: * * 12 H: . Choice A Choice B Choice C Cholce D Choice Choice F Choice G Choice H 2. [-/2.4 Points] DETAILS Eight payments of 1 are made consecutively with the first being at time 5 and the last being at time 12. Assume that the account has an effective rate of i. Which of these give the value of the annuity at time 17 Select all that apply Choice Formula Choice Formula A: E: B: . F: C: G: D: * * 12 H: . Choice A Choice B Choice C Cholce D Choice Choice F Choice G Choice H