Find the sum of the first 8th term of a linear sequence whose 1st term is 6 & whose last term is 46

Answer 1

Assuming the "last" term is the 8th term, then
S8 = 8/2 (6+46) = _____

and that's "sum of the first 8 terms" not "first 8th term." There is only one 8th term.