 where 
is the first term (so -1), and d is the common difference (-2). n is the number position in the sequence. As soon as we find the formula or model for this sequence we can find any number term we want. Filling in the formula:
and we'll clean that up just a bit:
(I just distributed through the parenthesis) and a bit more to
and if we want the 21st term, fill in a 21 for n:
and
so
Can she get some help
...
Answers: 3
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