Find the nth term and the indicated term of the arithmetic sequence whose initial term, a, and common difference, d, are given.a = 5; d = -4an = ?; a15 = ?
A. an = 5 - 4n; a15 = -51
B. an = 9 + 4n; a15 = -51
C. an = 9 - 4n; a15 = -15
D. an = 9 - 4n; a15 = -51
Answer: D
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