## TNNG 2 years ago Write the sum using summation notation, assuming the suggested pattern continues. -9 - 4 + 1 + 6 + ... + 66

1. TNNG

@whpalmer4

2. TNNG

@Reaper534

3. Reaper534

ohh thats easy it adds by 5

4. Reaper534

so 11 16 21 26 31 ect.

5. TNNG

so is it -9+5n

6. TNNG

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

7. TNNG

@Reaper534

8. Reaper534

tht will be the best choice

9. TNNG

thank you can you also help me in this problem

10. TNNG

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

11. Reaper534

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. TNNG

lol thank you so i just subtract -16-9

13. Reaper534

yeah u do u start from 2 or 25?

14. TNNG

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

15. Reaper534

2-9=7,...

16. Reaper534

ok gtg to my paper

17. TNNG

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

18. Reaper534

correct

19. TNNG

an i do this unitl i get to the ninth term

20. Reaper534

ok there u go now i relly gtg

21. TNNG

ight thanks