Question

Which of these is the equation for the nth term of the arithmetic sequence.

13, 19, 25, 31, …

Answer 1

(b) an = 13 +(n -1)6

Explanation:

The first term is a1 = 13, eliminating the 1st and 3rd choices.

The common difference is d = 19 -13 = 6. The multiplier of the common difference is (n -1), eliminating the 4th choice.

The correct choice is the 2nd choice:

`a_n=13+(n-1)6`