Question 1038899
You want a selection of how many terms and common difference.


{{{100-8=92}}}



{{{8+d(n-1)=100}}}
{{{d(n-1)=92}}}


{{{92=2*46=2*2*23}}}
You have an equation {{{d(n-1)=2*2*23}}}.
Ask yourself:  Do you want d to be 2, or 4, or 23, or 46 ?  Which?  After you choose, solve for a value of n that corresponds.



Notice, your question specifies FIVE terms.  THAT is what controls what you do.  You first are given a way to choose n.  
-
{{{n-1=(5-1)=4}}}.
You must start with {{{n=5}}} which gives your factor of 4.
NOW evaluate for common difference, d.




{{{d=23}}}