Question

here are the first four terms of an arithmetic sequence: 6,13,20,27 write down, in terms of n, an expression for the nth term of this sequence

Answer 1

common differences d = 7

A1 = 6

arithmetic sequence:

A(n)  = A1  + d(n - 1)

A(n) = 6 + d(n - 1)

Hope it helps