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Help with arithmetic in calc class please

  1. Dec 5, 2007 #1
    Given the approximate values: ln(2)=0.7 and ln(10)=2.3
    Use these approximations and an indirect argument using only arithmetic to explain how many decimal digits to expect in the number 2^40 and how do you know your correct?

    Well i know that we'll know if we are correct based on the decimal digits the calculator provides but how do I go about solving for the number of digits??I would greatly appreciate any help thankyou
  2. jcsd
  3. Dec 5, 2007 #2
    i got it, nevermind
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