## anonymous 3 years ago Write the sum using summation notation, assuming the suggested pattern continues. -9 - 4 + 1 + 6 + ... + 66

1. anonymous

@whpalmer4

2. anonymous

@Reaper534

3. anonymous

ohh thats easy it adds by 5

4. anonymous

so 11 16 21 26 31 ect.

5. anonymous

so is it -9+5n

6. anonymous

$\sum_{n=0}^{15} (-9+5n)$

7. anonymous

@Reaper534

8. anonymous

tht will be the best choice

9. anonymous

thank you can you also help me in this problem

10. anonymous

Find the sum of the first 9 terms of the sequence. Show all work for full credit. 2, -7, -16, -25, ...

11. anonymous

2-9=-7-8=-16-... so u subtract by 9 im alo in school right now too i need to get back at that lol

12. anonymous

lol thank you so i just subtract -16-9

13. anonymous

yeah u do u start from 2 or 25?

14. anonymous

alright so 2-9, -7-9, -16-9, 25-9 and i will have my answer

15. anonymous

2-9=7,...

16. anonymous

ok gtg to my paper

17. anonymous

-7-9= -16, -16-9=-25-9=-34... and so on

18. anonymous

correct

19. anonymous

an i do this unitl i get to the ninth term

20. anonymous

ok there u go now i relly gtg

21. anonymous

ight thanks