What does r equal in pre-calculus?

Question

xapproachesinfinity · Answer

r for what? your question ambiguous 
what does r stand for ?

sammixboo · Answer

Anything can be r, kinda have to be more specific.

r can mean radius
r can be any variable
r can be root
r can be anything

sammixboo · Answer

r can even stand for raspberries

xapproachesinfinity · Answer

be specific

sammixboo · Answer

r can mean rate

List goes on

anonymous · Answer

Its for geometric series. Sorry I thought there is only one r in cal o-o

Im still new to this

nnesha · Answer

r = ratio

sammixboo · Answer

Yes, ratio

utterly_confuzzled · Answer

It can stand for resultant

sammixboo · Answer

Let me find that one site I found that on

sammixboo · Answer

http://www.purplemath.com/modules/series5.htm

nnesha · Answer

common ratio for geometric sequence which you multiply by previous number to get next term

anonymous · Answer

is it a_2 over a_1?

nnesha · Answer

a_2 2nd term
a_1 first term

anonymous · Answer

oh multiply okay

nnesha · Answer

$$\huge\rm r = \frac{ a_2 }{ a_1 }$$
this formula to find ratio for example if you ahve this sequence 
3,9,27
 $$\huge\rm r = \frac{ a_2 }{ a_1 }$$ a_2 (2nd term which is 9) (a_1 which is first term 3) 
so divide 2nd term by 1st one to get ratio

nnesha · Answer

|dw:1427677090472:dw|
9/3 = 3
so r=3 
you have to multply previous term by 3 to get next term