Lukecrayonz
  • Lukecrayonz
y
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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Lukecrayonz
  • Lukecrayonz
|dw:1333318740441:dw|
Lukecrayonz
  • Lukecrayonz
@satellite73 done :P
anonymous
  • anonymous
\[-\frac{1}{5}\] is what i get

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Lukecrayonz
  • Lukecrayonz
I'm looking at how my textbook explains it, it doesn't make any sense.
Lukecrayonz
  • Lukecrayonz
Can you explain please? I like answers but I like to know what to do even more :P
Lukecrayonz
  • Lukecrayonz
OH CRAP LOL, left out a god damn number.
anonymous
  • anonymous
you are starting at 1 and not zero right?
Lukecrayonz
  • Lukecrayonz
|dw:1333319020572:dw|
Lukecrayonz
  • Lukecrayonz
Okay, so please explain with that new problem :)
anonymous
  • anonymous
pull the 3 out front then makes no difference \[3\sum_{k=1}^{\infty}(-\frac{1}{4})^k\]
anonymous
  • anonymous
you are starting at k = 1 use \[\frac{a}{1-r}\] with \[a=\frac{1}{4}, r=-\frac{1}{4}\]
Lukecrayonz
  • Lukecrayonz
Oh! So just take your original answer and multiply it by 3?
anonymous
  • anonymous
yes
Lukecrayonz
  • Lukecrayonz
Leaving it with -0.6, which is a possible answer.
anonymous
  • anonymous
yes \[\frac{\frac{1}{4}}{1-\frac{-1}{4}}=-\frac{1}{5}\]
Lukecrayonz
  • Lukecrayonz
http://screensnapr.com/v/hGADyO.png Can you check my answer for that?
anonymous
  • anonymous
it is right
Lukecrayonz
  • Lukecrayonz
http://screensnapr.com/v/sKHUdw.png

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