Answer:
r = -1.5
Step-by-step explanation:
recall that ,the recursive formula for a geometric sequence [tex]a_n[/tex] is :
[tex]a_{n} = r \times a_{n-1} \ \ \text{where r is the common ratio }[/tex]
therefore
The common ratio of the sequence:
[tex]a_{n} = -1.5 \times a_{n-1}[/tex]
is r = -1.5
