Respuesta :

irspow
The common ratio is the constant found when you divide any term in a geometric sequence by the term preceding it.  

-0.9/0.1=8.1/-0.9=-9

The common ration is negative 9.
Blacklash

Answer:

Common ratio, r = -9

Step-by-step explanation:

If we have geometric progression, the common ratio is the ratio of (n+1)th term and nth term.

Here geometric progression is

       0.1,-0.9,8.1,.................

Common ratio

           [tex]r=\frac{-0.9}{0.1}=-9\\\\r=\frac{8.1}{-0.9}=-9[/tex]

Common ratio, r = -9