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.a1 = 
, d = - 
A. an = 
n - 
; a20 = 
B. an = - 
n + 
; a20 = - 
C. an = - 
n + 
; a20 = - 30
D. an = 
n - 
; a20 = 30
Answer: C
Mathematics
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