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Math Help - Finding x in fraction with scientific notation

  1. #1
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    Finding x in fraction with scientific notation

    Hi I need help with this problem...I cant figure it out...help would be appreciated! (Trying to find x)

     \frac{\ 10^8}{10^5} = \frac{\ x}{10^9}
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  2. #2
    Member HappyJoe's Avatar
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    Do you know your power rules?

    You need the rules:

    \frac{10^m}{10^n}=10^{m-n},
    10^m\cdot 10^n = 10^{m+n}.

    So for example, in your setup, we have

    \frac{10^8}{10^5}=10^{8-5}=10^3.

    And you could multiply both sides of the equation by 10^9 to get rid of that in the denominator on the right hand side.

    Hope this gives you a clue. Otherwise, feel free to ask about troublesome parts.
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