Question

A linear sequence starts

11
20
29
38
Work out an expression for the nth term of the sequence.
The nth term is n+9

Answer 1

The correct answer is 9n+2

Answer 2

9n + 2.

Explanation:

This is arithmetic with common difference d = 9.

nth term = a1 + d(n - 1) (a1 = 11) 11 + 9n - 9

= 11 + 9(n - 1)

= 9n + 2.