Hello,
Your answer would be D.
Answer:
The answer is D
Step-by-step explanation:
This is because the x value didn't change while the y values became negative.
15+(10-x)=15 would be your equation if that is what you are looking for.
Assuming the sequence goes on like this 11,-33,99,-297,891,...,
its general formula is

So, the 9th term is