Write a formula for the general term (the nth term) of the arithmetic sequence. Then use the formula for an to find a20, the 20th term of the sequence.20, 13 , 6, -1, . . .

A. an = 20 - 7n; a20 = -120
B. an = 7n - 20; a20 = 120
C. an = 7n - 27; a20 = 113
D. an = 27 - 7n; a20 = -113


Answer: D

Mathematics

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