17. Find the first 12 terms of the following sequence, using the recursive definition. Then, find and state the 500th term. t, =-2, t2 = 3, tn = tn-1 - tn-2 18. Shruti initially has 6000 dollars in her bank account. At the end of each month, she takes out 20% of the money for expenses, and then adds 900 dollars from her job. (a) Write a recursive rule for the money in Shruti's account at the end of each month. Make sure that your rule is complete. (b) Calculate how much money is in the account at the end of the 7th month