t(n) = n2 + 5n - 1
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35 * * * * * That is the next term. The question, however, is about the nth term. And that is 6*n - 1
It is 6n+5 and so the next term will be 35
a (sub n) = 35 - (n - 1) x d
n + 6 * * * * * I suggest you try t(n) = 6n + 5 instead.
If the nth term is n*7 then the first 5 terms are 7, 14, 21, 28, 35.