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Write a formula for the general term (the nth term) of the arithmetic sequence shown below. Do not use a recursion formula. Then use the formula for a'n to find a20, the 20th term of the sequence.

a'1 = -13, d = -5

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well, for any A.P., the nth term, Tn is

Tn = a + (n-1)d

So, plug in your numbers.

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