Question

he first five terms in the arithmetic sequence  an

 =  8n , starting with  n  =  1 .

Answer 1

`a_n=8n\\ \\a_1=8\cdot1=8\\a_2=8\cdot2=16\\a_3=8\cdot3=24\\a_4=8\cdot4=32\\a_5=8\cdot5=40`

Answer 2

8,16,24,32,40
All you have to do is replace the n in 8n with the sequance number you're looking for
like for instance:
8(1)=8
8(2)=16