Question

I have absolutly no clue on this one o-o
Can you help please :o
@amistre64 @acxbox22

Answer 1

its going to help to have a clue ...

Answer 2

i simply dont get paid enough to do all the thinking :)

Answer 3

Im sorry but I have no idea what that means xD

Answer 4

is the sequence arithmetic or geometric? how do we tell?

Answer 5

geometric

Answer 6

good, and our common ratio is?

Answer 7

3

Answer 8

hmm 3r = 12, 12r = 48 what is r?

Answer 9

R is ratio right? So its being multiplied by 3

Answer 10

3*3 = 9, not 12
12*3 = 36, not 48

lets say r=4

the formula is:\[S_n=a_1\frac{1-r^n}{1-r}\]

Answer 11

all we really need to determine now is the value of n

Answer 12

TIMES 4 IM SORRY I READ MY CALCULATOR WRONG

Its 4 i know what 3*3 is xDD

Answer 13

we know the first term, we know r, and we know the value of the last term giving us:

49152 = 3(4)^(n-1) and we solve for n

Answer 14

preethas here so we might be getting filmed :)

Answer 15

...filmed? For what?

Answer 16

lol

Answer 17

and hold on lemme work out that equation

Answer 18

i wanta be part of da action!

Answer 19

when im older im going to write my memoirs ... this will be proof that i failed in life lol

Answer 20

LOLOLOLOL

Answer 21

idk what to say to that xD

And I have 49152^n-1 but idk what n is D:

Answer 22

49152 = 3(4)^(n-1)

49152/3 = 4^n 4^(-1)

4*49152/3 = 4^n

log(4*49152/3) = n log(4)

log(4*49152/3) / log(4) = n

Answer 23

woah what no I have 49152=12^n-1

Answer 24

http://www.wolframalpha.com/input/?i=log%284*49152%2F3%29+%2F+log%284%29

n=8 ...

Answer 25

AMI I AM SO LOST. THAT IS SO MANY NUMBERS

Answer 26

i used the acceptable amount of numbers, even tried to put some extra ones in there to boot

Answer 27

does 3(4)^7 = whatever that last number was? 49152?

Answer 28

yes it does

Answer 29

lets assume im right :)

now we work the formula

\[S_8=\frac{3(1-4^8)}{1-4}\]

Answer 30

Hi mom!

Answer 31

how many times do i have to tell you!! im not your mother!!!

Answer 32

21842

Answer 33

you might want to change the batteries in your calculator

Answer 34

3(1-4^8)/(1-4)

http://www.wolframalpha.com/input/?i=3%281-4%5E8%29%2F%281-4%29

Answer 35

-196609 o.O

Answer 36

it begins with an A and ends with a 5 ....

Answer 37

65 thousand is a lot different from whatever the hell my number was o-o

Answer 38

i agree, hence the reference to a change of batteries :)

Answer 39

xD Okay thank you ami ^_^

Answer 40

youre welcome :)

Answer 41

wait really quick what was the formula for this?

Answer 42

go to the 10th post down :)

Answer 43

kk got it ty ray ;p

Answer 44

and ami :o <33