Question

Which one is the correct answer, and why?

Answer 1

D f(n) = 7n-12

Explanation:

The first term is -5

The second term is -5+7 =2

The common difference is 7

an = a1 +d(n-1) where d is the common difference

= -5 +7(n-1)

Distribute the 7

= -5 +7n -7

7n -12