Question

Write the series in summation notation:

-3 + 6 - 9 + 12 - 15

Answer 1

\[\sum_{k=1}^{5} (-1)^{k}(3k)\]

Answer 2

\[\sum_{k=0}^{4} (-1)^{k}-1(3k)\]

Answer 3

the first one seems adequate to me

Answer 4

alternating multiples of 3

Answer 5

do you wanna see the other two answer choices?

Answer 6

how many correct options can you choose?

Answer 7

just one

Answer 8

then since the first one is adequate (i dont know how your author defines proper notation); then the others would seem a bit futile

Answer 9

well the other two are quite like the first two :P

Answer 10

if you want to type them up for comparison, that would be fine.

Answer 11

\[\sum_{K=0}^{4}(-1)^{k}(3k)\]

Answer 12

\[\sum_{k=1}^{5} (-1)^{k} -1(3k)\]

Answer 13

there :)

Answer 14

is 3(4) equal to 15?

Answer 15

no?

Answer 16

the last 3 simply dont match the numbers in the sequence ....

Answer 17

so you plug the sequence numbers in for k?

Answer 18

yes

Answer 19

oh alright!! thankyou very much :)

Answer 20

good luck