Answer: Option a.
Step-by-step explanation:
1. The sequence shown in the problem is a Geometric sequence, because it has a common ratio. This means that when you multiply one of those numbers by the common ratio, you obtain the next number.
2. Then, you can calculate the common ratio as following:
[tex]r=\frac{108}{-324}=-\frac{1}{3}[/tex]
3. Therefor, the next term is:
[tex](12)(-\frac{1}{3})=-4[/tex]
