Find the first term and the common difference of the arithmetic sequence described. Give a formula for the nth term of the sequence.5th term is -21; 12th term is -84
A. a = 15; d = 9; an = -9n + 24
B. a = 15; d = -9; an = -9n - 24
C. a = 15; d = -9; an = -9n + 24
D. a = 6; d = -9; an = 15n - 9
Answer: C
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D. 
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