David owes Mark some money. Mark has offered to pay back the money he owes by one of these two options. Option 1: A payment of 500 at time 1 and a payment of 700 at time 6. Option 2: A payment of 800 at time 2 and a payment of X at time 4. Which of the following are equations of value that can be used to determine X, assuming both options have the same annual effective rate of interest i Select all that apply

500*(1+i)³ + 700*v² = 800*(1+i)² + X

500*v + 700*v⁶ = 800*v² + X*v⁴

500*(1+i) ⁵ + 700 = 800*(1+i)⁴ + X*(1+i)²

500*v + 700*v⁶ =800*(1+i)⁴ + X*(1+i)²

500*(1+i) + 800 = 700*v⁴ + X*v²

500*v^-1 + 700*v⁴ = 800 + X*v²

500*(1+i) + 700*v⁴ = 800 + X*v²