Respuesta :
Answer:
Step-by-step explanation:
common ratio of a Geometric series can be found by dividing the second term by first term of the series .
we are given that first term a1= -125 and second term a2 =-25
so the common ratio must be
[tex]r=\frac{a2}{a1}[/tex]
[tex]r=\frac{-25}{-125}[/tex]
[tex]r= \frac{1}{5}[/tex]
Hence the common ratio is 1/5.
