Question

Help please I don't understand this...I will fan and medal!!!!!


What is S7 for 6-24+96-384+...?
A.) 19,662
B.) -78,642
C.) -4,914
D.) 1,230

Answer 1

@K12awesomeness

Answer 2

@usercode3rror

Answer 3

I think its multiplying -4

Answer 4

I think ur right..

Answer 5

but my answer for S7 isnt in the answer choices @K12awesomeness

Answer 6

for S7 i got 24,576

Answer 7

ohh

Answer 8

I don't know....

Answer 9

I don't have paper and I'm on a phone, so I can't validate this, but I believe finding all the numbers than adding them up should work

6-24 is -18
-18+96 is 78

And so on

Answer 10

@shaik0124

Answer 11

see u need to answer the sum of first seven terms....
and u see the common ratio is -4
and
\[S_n = a \frac{ 1 - r^n }{ 1 - r }\]

Answer 12

explain how to set it up please

Answer 13

with the numbers from the problem

Answer 14

@rish so it's finding S1 through S7, then adding them all? I never learned this myself, wouldn't mind to

Answer 15

@SnowCrystal see the first term is 6 , the second is -24 , third is 384 and so on
and ratio is -24/6 or384/(-24) = -4

Answer 16

omg i did im so srry

Answer 17

i fixed it

Answer 18

it was supposed to be 19,662 for A

Answer 19

lol u see this question was askd before...xD bt cant find the link

Answer 20

wait... it was???

Answer 21

@SnowCrystal u were the one to post this question before -_- really???
http://openstudy.com/users/rishavraj#/updates/56e0471ce4b0424cb0fcd669

Answer 22

wait i dont remember posting it

Answer 23

visit the link i attached

Answer 24

thank you so much i dont know why i dont remember asking that question

Answer 25

@SnowCrystal hold on didnt u understand the previous time??

Answer 26

ya i have problems remembering things so seeing that question from before and reading through it helped

Answer 27

ooooo good then.....and if its so trust me u need to practice a lot .... no offense jst an addvice :))

Answer 28

ya i know i do thats why i come here for help :)