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November 2nd, 2011, 05:12 PM  #1 
Newbie Joined: Sep 2011 Posts: 18 Thanks: 0  Difficult Local Linearization Problem
The "rule of 70" is used o estimate the number of years it will take for the money in a bank account to double based of the interest rate, i%. The rule states that the amount will take 70/i years to double. Find the local linearization of ln(x+1) and explain how this proves that the rule works. So I understand how the find the local linearization. It would be L(x)=ln(a+1)+((xa)/(1+a)). But how does this relate to the rule? I'm completely lost after this point. Any help? 
November 3rd, 2011, 06:12 PM  #2 
Senior Member Joined: Jul 2011 Posts: 118 Thanks: 0  Re: Difficult Local Linearization Problem 
November 3rd, 2011, 09:08 PM  #3 
Newbie Joined: Sep 2011 Posts: 18 Thanks: 0  Re: Difficult Local Linearization Problem
Thank you!!


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