Find the common difference d and the nth term an of the arithmetic sequence with the specified terms. 4th term is 21; 6th term is 39
A. d = 9; an = 9n - 15
B. d = 3; an = 3n + 9
C. d = 6; an = 6n + 15
D. d = 9; an = 9n - 6
Answer: A
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