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Math Help - Using logarithm to find earthquake strength

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    Question Using logarithm to find earthquake strength

    Word Problem that I'm stuck on
    The common logarithm is used to measure the intensity of an earthquake on the Richter scale. The Richter scale rating of an earthquake of intensity I is given by log(I) - log(Io), where Io is the intensity of a small "benchmark" earthquake. Write the Richter scale rating as a single logarithm. What is the Richter scale rating of an earthquake for which I = 1000*Io?
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    log (I/I0). For the second part, log1000
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    Quote Originally Posted by vidalex View Post
    Word Problem that I'm stuck on
    The common logarithm is used to measure the intensity of an earthquake on the Richter scale. The Richter scale rating of an earthquake of intensity I is given by log(I) - log(Io), where Io is the intensity of a small "benchmark" earthquake. Write the Richter scale rating as a single logarithm. What is the Richter scale rating of an earthquake for which I = 1000*Io?
    You should know the rule \log A - \log B = \log \frac{A}{B}.
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