Salutations!
to find the nth term in a sequence, you will be needing a formula.
[tex]a+(n-1)*d[/tex]
where [tex]a[/tex] stands for the first term in a sequence (the first number in a sequence)
[tex]d[/tex] stands for the difference between the 2nd term and 1st terms (always remember to subtract from the 2nd term to the 1st term, not the other way around)
and [tex]n[/tex] is what we are going to find.
[tex]a=100[/tex]
[tex]n=8[/tex]
[tex]a+(n-1)*d[/tex]
[tex]100+(n-1)*8[/tex]
[tex]100+8n-8[/tex]
[tex]8n=92[/tex]
Hope this helps!
Have a great day!