Answer:
The answer is in the media.Good luck!
I hope this is correct. I solved it using the addition elimination method. The answer is s= 2, and r= 5. I hope that was helpful.
7. 20
8. 680
9. 700
10. 4,000
11. 106,000
12. 5,800
I think the answer is d if it followed the sequence or should be -1 but that’s not an option so my best guess is d hope this helps