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Homework Help: Please check this maths question thanx

  1. Feb 5, 2007 #1
    1. The problem statement, all variables and given/known data
    (* to the power of) 20m3 equals to
    a)2x10-8km3
    b)2x10*6cm3
    c)2x10*5dm3
    d)2x19*9mm3

    2. Relevant equations
    ok
    1000m=1km
    so 1km3 is equal to 1000x1000x1000=10*9
    so 10*9/20m3=50,000,000

    1km3/50x10*6=20
    from here i'm confused
    ..............................
    3. The attempt at a solution

    iv attempted to use this method for all the above case yet i continue to get confused help would b warmly appreciated
     
  2. jcsd
  3. Feb 5, 2007 #2
    "1km3/50x10*6=20
    from here i'm confused"

    Does writing it this way make it any easier?
    [tex]\frac{1}{50\times10^{6}} km^3 =
    \frac{1}{50}\times
    \frac{1}{10^{6}}km^3 = 20m^3[/tex]
     
    Last edited: Feb 5, 2007
  4. Feb 5, 2007 #3
    sir i'd like to know a step by step approch to tackle this question, can you please provide one thank you
     
  5. Feb 5, 2007 #4
    What you've done above is correct (other than leaving out the m^3 at the end), i.e.

    What's 1/50? And how would you write 1/106 as a power of 10?
     
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