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, 15 , 10, 5, . . .
A. an = -5n + 25; a20 = -75
B. an = 5n - 25; a20 = 75
C. an = -5n + 20; a20 = -80
D. an = 5n - 20; a20 = 80
Answer: A
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