Question: In Exercises 1921, write a formula for the general term (the nth term) of each arithmetic sequence. Do not use a recursion formula. Then use

In Exercises 19–21, write a formula for the general term (the nth term) of each arithmetic sequence. Do not use a recursion formula. Then use the formula for an to find a20, the 20th term of the sequence.

an = an-1 - 5, a1 = 3

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