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 = - 
D. an = n - ; a20 = 

Answer: A

Mathematics

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