Question

Write a recursive formula for the sequence 5, 18, 31, 44, 57, ... Then find the next term. I’m thinking that the answer is A.

A. a1=-8; an=an-1+13. The next term is 70
B. a1=5; an=an-1+13. The next term is 70
C. a1=5; an=an-1-13. The next term is 83
D. a1=-8; an=an-1-13. The next term is 83

Answer 1

Hmmm. close, but what is the first term (a1)?

Answer 2

a with a small 1 next to it a_1

Answer 3

yes, but a1 is 5, not -13 !