Find the nth term and the indicated term of the arithmetic sequence whose initial term, a, and common difference, d, are given.a = 7; d = -7an = ?; a13 = ?
A. an = 14 + 7n; a13 = -77
B. an = 14 - 7n; a13 = -77
C. an = 7 - 7n; a13 = -77
D. an = 14 - 7n; a13 = -28
Answer: B
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