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.-26, -33 , -40, -47, . . .
A. an = 7n + 19; a20 = 159
B. an = 7n + 26; a20 = 166
C. an = -7n - 26; a20 = -166
D. an = -7n - 19; a20 = -159
Answer: D
Mathematics
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