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Math Help???????

Find how long it takes $2000 to double if it is invested at 7% interest compounded semiannually.
Use the formula
 
A=P  (  1- r/n) nt  to solve the compound interest problem
 
It will take approximately ????? years
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1 Answer

I answered on the other question you asked. Double-check the formula you put here, as I think it needs a plus sign, in the parentheses. 
 
Also, use the other problem to guide you through this one. I hope you'll share your work, so we can help you through this one if you get stuck. :)