8. Find the area of the following quadrilateral. Show all of your work, and 28 121 round your answer to the nearest hundredth. D 15 m A B 9. Alex initially has 5000 dollars in her special bank account. At the end of each year, she takes out 25% of the money for taxes, and then adds 700 dollars from her investment earnings. (a) Write a recursive rule for the money in Alex's account at the end of each year. Make sure that your rule is complete. (b) Calculate how much money is in the account at the end of the 3rd year. 10. Given the following terms of a sequence, find and state both the nth term definition and the recursive definition. Show all work, make sure your definitions are complete, and state your answer in terms of n (not n-1) for the nth term. -1, 2, 7, 14, 23, 34, 47, 62, 79,... 11. Find a formula, S, , for the following series. Also, find S,, S2, S30 Show all work, and simplify your formula for full credit. For the last sum, find the exact value and NOT an approximation. -2e + e + 4e + 7et... + an