Determine whether this sequence is arithmetic or geometric. Find the next three terms.

Question

4. 3, 12, 21, 30, ....
A.40, 50, 60
B.38, 46, 54
C.39, 48, 57
D.36, 32, 39
A?
Thank you

Answer 1

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.

Answer 2

Yea but on my paper it doesn't say it like it does on the previous questions so I kind of got confused.

Answer 3

The answer is C.

Answer 4

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.

Answer 5

Yes, C is the correct answer. The common difference here is +9, resulting in those next 3 terms, making the entire sequence true.

Answer 6

I know I said it was C now.

Answer 7

Thank you

Answer 8

I'm Sorry. I was typing that, so I didn't see that until I posted that. My apologies.

Answer 9

We write at the same time again. LOL

Answer 10

Yeah. haha. But no problem. I'm glad to be able to help.