## anonymous 5 years ago hey can anyone help me with series/sequences? (algebra 2)

1. anonymous

hey what type of sequences/series?

2. anonymous

um not sure can i give u a problem and u try to help?

3. anonymous

????

4. anonymous

sure

5. anonymous

Write the series using summation notation. 7 + 10 + 13 + 16 + 19

6. anonymous

ah ok. so the first number is 7, so that is a constant

7. anonymous

k...

8. anonymous

do i have to pay to get help on here??

9. anonymous

$\sum_{n=0}^{n=4} 7+3*n$ so something liek that?

10. anonymous

yes but how did u get that....

11. anonymous

well, you are trying to make the summation equation part of it (the 7 + 3*n in this case), generate all of the numbers in the series if you input different values for "n". So given 7+10+13+16+19, you can start at the left. So if when n=0, the thing on the right is 7, then we know that 7 is a part of the summaition series

12. anonymous

oh

13. anonymous

so then the question is , what can I add to 7, so when n=1 I'm adding 10, when n=2 I'm adding 13, and n=3 I'm added 16

14. anonymous

so in fact my answer was wrong =)

15. anonymous

o...

16. anonymous

or wait, sorry, I was right lol

17. anonymous

ok so if n=0, and the right side is 7

18. anonymous

and n=1, and the right side is 10

19. anonymous

20. anonymous

so my guess is that the right side is 7+3(n)

21. anonymous

let's see if it holds true for n=2

22. anonymous

for n=2, according to me, the third number is the series would be: 7 + (3*2) = 7+6 = 13

23. anonymous

and so on..

24. anonymous

kk thanks!!!!!!!

25. anonymous

do i have to pay for this..

26. anonymous

no its free