Question

MATH TIME!!!

Answer 1

10.6666
21.3333
42.6666
5.3333

Answer 2

Calculate the sum:

Answer 3

@freckles

Answer 4

@pmkat14

Answer 5

@pooja195

Answer 6

@asnaseer

Answer 7

@Godlovesme

Answer 8

sowwyyy idk this stuff :/

Answer 9

@radar

Answer 10

@mathmath333

Answer 11

@phi

Answer 12

hint:
\[\sum_{i=2}^{14}128(\frac{1}{4})^i \\ =[\sum_{i=0}^{14}128(\frac{1}{4})^i]-128(\frac{1}{4})^1-128(\frac{1}{4})^0\]

Answer 13

freckles thank god ur here

Answer 14

work that out?

Answer 15

well for the first term you can use that formula we been using

Answer 16

\[=128 \cdot \frac{1-(\frac{1}{4})^{14}}{1-\frac{1}{4}}-128(\frac{1}{4})-128\]
then after you use that formula you can take care of those other differences

Answer 17

yeah i got that too

Answer 18

well let's work on that first term there

Answer 19

(1/4)=.25
and (.25)^(14)=?

Answer 20

lol you might not want to use the phone calculator for this

Answer 21

unless you have one those app calculators that might be okay

Answer 22

well whatever you do you do 1-that answer

Answer 23

then divide that by (.75)

Answer 24

you know since 1-.25 is .75

Answer 25

it wont work on my cal

Answer 26

hmm... then get a calculator that isn't your phone

Answer 27

or get an app calculator
sometimes those are okay

Answer 28

or use this calculator http://www.wolframalpha.com/input/?i=%281-%28.25%29%5E%2814%29%29%2F%28.75%29

Answer 29

ok it said 1.3333333333

Answer 30

so you have something close to:
\[128(1.3333)-\frac{128}{4}-128\]

Answer 31

and the reason I said close because like before on that one question we are again working with approximations

Answer 32

yes

Answer 33

see if you can finish this

Answer 34

u know i cant

Answer 35

so i got 1.3333 then what?

Answer 36

don't you know order of operations?

Answer 37

do 128 times 1.3333

Answer 38

or @Howard-Wolowitz you can enter what I have above into that calculator website I just gave you

Answer 39

i got 170.6624

Answer 40

okay then just take away 128/4 and then from that take away 128

Answer 41

good luck
i have to go

Answer 42

by take do u mean subtract???

Answer 43

@ganeshie8

Answer 44

@hartnn

Answer 45

Hi I'm still stuck

Answer 46

@AdamK

Answer 47

@mathmate

Answer 48

this is a geometric series with first term (1/4)^2 and common difference = 1/4
* 128

so sum = 128 * (1/16) *[ (1/4)^13 - 1] / (1 - 1/4)

Answer 49

ok i got as far as getting 1.3333

Answer 50

* i made an error in last post = it should be / (1/4 - 1)

Answer 51

what did you do to get 1.3333

Answer 52

i didnt that other guy did

Answer 53

he also said the answer was 10.6666

Answer 54

right so multiply this by the first term 1/16
then multiply by 128 and you've got it

Answer 55

1.3333 * 0.0625 * 128

Answer 56

( note 1/16 = 0.0625)

Answer 57

ok one sec

Answer 58

ok i got 10.6664

Answer 59

right
thats option a

Answer 60

AWESOME ok next question

Answer 61

new thread or no

Answer 62

sorry gotta go right now