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:

3. Therefor, the next term is:

I don't think I understand what you mean, but I will guess. A quadrilateral must have 4 sides to it and have 4 vertices (corners).
Answer:
xy= 302,400
Step-by-step explanation:
12 - 25 is equal to -13.
Just think of it as 25 minus 12. This gives you 13. Then put a negative sign in front of it.