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.-11, -17 , -23, -29, . . .
A. an = -6n - 5; a20 = -125
B. an = 6n + 11; a20 = 131
C. an = -6n - 11; a20 = -131
D. an = 6n + 5; a20 = 125
Answer: A
Mathematics
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