How do I do natural logs on a TI-84?
The natural log is a button, LN, on the calculator. Locate the POWER button then look two buttons above that to find the LN button.
You would use the LN in the same manner that you use other functions of the calculator. Press the LN button then enter the value or variable that you are attempting to find the natural log of. Then press the ENTER button for the results.