Answer :

morganlouch01oriely
tn=-11+8(n-1). n represents which number of the sequence you will find, so if you plugged in a 3 you would find the third number in the sequence. 
RickyChen
In this sequence, a1 = -11, k = 8

So an = a1 + (n-1)k = -11 + (n-1)*8 = 8n - 19

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