Write a recursive formula for the arithmetic sequence below. What is the value of the 8th term? 1,5,9,13,...
Is it A.A(n)=A(n-1)-4;4 B. A(n)=4A(n-1);4
C. A(n)=A(n-1)=4;29 or D. A(n)=-4A(n-1);-27

Question

Write a recursive formula for the arithmetic sequence below. What is the value of the 8th term? 1,5,9,13,...
Is it A.A(n)=A(n-1)-4;4 B. A(n)=4A(n-1);4 
C. A(n)=A(n-1)=4;29 or D. A(n)=-4A(n-1);-27

anonymous · Answer

Help me please.

mathmale · Answer

Let me begin by asking you some questions.  How do we get from 1 to 5?  How do we get from 5 to 9?  from 9 to 13?  Does this "ring a bell" with yo u?

anonymous · Answer

No.
Thats why im on this site man.

anonymous · Answer

I know the common difference is 4.

anonymous · Answer

Can someone give me a answer?

mathmale · Answer

Well, Rached, first you say "no," then you give me the common difference, which is 4.and is 100% correct.


Each successive term is = to the preceding term, plus 4.  Can you write that as a recusion formula?

mathmale · Answer

Hope you're not just looking for "answers."  I'm delighted to guide you through a problem solution, but anything but delighted to just provide answers.

anonymous · Answer

A(n)=A(n-1)+4;29??

mathmale · Answer

While I'm not going to check every detail of your reply, yes, I believe you're on the right track.  You can check your 8th term by writing out all of the first 8 terms.

anonymous · Answer

Noice