## anonymous 5 years ago write the arithmetic series 100+95+90+85+80 in summation notation.

1. myininaya

$\sum_{i=1}^{4}(100-5i)$

2. myininaya

oops i=0 sorry

3. anonymous

$\sum_{n=0}^{5}(80+5n)$

4. myininaya

$\sum_{i=0}^{4}(80+5i)$

5. myininaya

you can use either 1 i mentioned but bout cases you have i=0 to 4 since you have 5 terms

6. anonymous

sorry....for that...thanks..

7. myininaya

np

8. myininaya

a made a mistake on first one i mentioned i went from i=1 to i=4 when i should had i=0 to i=4

9. myininaya

$\sum_{i=15}^{20}5i$

10. myininaya

i=16 to i=20

11. myininaya

there are probably some more you can write

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