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.1, 5, 9, 13, 17, . . .
A. an = 3n - 4; a20 = 56
B. an = n + 4; a20 = 24
C. an = 4n + 3; a20 = 83
D. an = 4n - 3; a20 = 77
Answer: D
Mathematics
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