Which one is a rule for the nth term of an arithmetic sequence with a8 = 56 and d = 5?

Answer 1

an=a1+(n-1)*d

a8=a1+(8-1)*5
a8=a1+7*5
a8=a1+35
a8-35=a1
a1=a8-35
a1=56-35
a1=21

So this arithmetic sequence is:
21,26,31,36,41,46,51,56

Answer 2

where did u get 56?