Asked by Morgan

Determine whether this sequence is arithmetic or geometric. Find the next three terms.
4. 3, 12, 21, 30, ....
A.40, 50, 60
B.38, 46, 54
C.39, 48, 57
D.36, 32, 39
A?
Thank you
Answered by Irving
A is not the correct answer here unfortunately.

Also, are the "Arithmetic" or "Geometric" parts of the answers missing? They were there for the previous questions I helped you with.
Answered by Morgan
Yea but on my paper it doesn't say it like it does on the previous questions so I kind of got confused.
Answered by Morgan
The answer is C.
Answered by Irving
Alright, yeah. That's kind of confusing. Still, A is not the correct answer.

A's next 3 terms assume this is an arithmetic sequence, as the common difference is +10. (60-10=50 & 50-10=40). That is not the correct sequence based on the first 4 terms of 3, 12, 21, and 30.
Answered by Irving
Yes, C is the correct answer. The common difference here is +9, resulting in those next 3 terms, making the entire sequence true.
Answered by Morgan
I know I said it was C now.
Answered by Morgan
Thank you
Answered by Irving
I'm Sorry. I was typing that, so I didn't see that until I posted that. My apologies.
Answered by Morgan
We write at the same time again. LOL
Answered by Irving
Yeah. haha. But no problem. I'm glad to be able to help.
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