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Practice A: Geometric Sequences Problems 13-14 Use the table provided to write the explicit formula and the recursive formula for each sequence. 13. 14 72 1 2 3 5 n 2 3 4 an 1 Q 81 729 6561 5 2.5 1.25 0.625 Problems 15-18 A geometric sequence is represented by the recursive formula an = 3 . an-1, a1 = 12. 15. Write the first six terms of the sequence. n an 16. Explain what you did to find the first six terms of the sequence using the recursive formula. 17. Write the sequence as an explicit formula. 18. Calculate the value of a11. Explain how you found your