Question

write the arithmetic series 100+95+90+85+80 in summation notation.

Answer 1

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

Answer 2

oops i=0 sorry

Answer 3

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

Answer 4

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

Answer 5

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

Answer 6

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

Answer 7

np

Answer 8

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

Answer 9

\[\sum_{i=15}^{20}5i\]

Answer 10

i=16 to i=20

Answer 11

there are probably some more you can write