determine whether each sequence is geometric. if so identify the common ration and find the next two terms.
1,3,5,7

Question

determine whether each sequence is geometric. if so identify the common ration and find the next two terms.
1,3,5,7

anonymous · Answer

@whpalmer4

whpalmer4 · Answer

what's the test for a geometric sequence?

anonymous · Answer

um not sure do we take the second term and divide it by the first??

whpalmer4 · Answer

sounds good.  what do you get?

anonymous · Answer

well 3/1=3 lol

anonymous · Answer

where did you go lol @whpalmer4

whpalmer4 · Answer

Yeah.  Okay, now divide the 3rd term by the 2nd term.  Is the ratio the same?  If so, it might be geometric. If not, it isn't.

anonymous · Answer

is it arithmetic because you can add 2 to get the next term. 
it is not because when you divied 5/3=1.66666

whpalmer4 · Answer

it is arithmetic, yes.  It is not geometric because the ratio didn't hold.  We'd really want to try all of the known terms before deciding it is geometric, just in case it is some weird sequence that looks geometric for a few terms, but then isn't.

anonymous · Answer

oh ok lol makes sense