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Half-Life Calculator Program (Ti-89, Ti-84, and Ti-83)

Half-Life Calculator Program (Ti-89, Ti-84, and Ti-83)
The purpose of this Instructable is to show you how to write a half-life program on your calculator. The program will make it very quick and easy to find to half-life, initialmass, time, or final mass. All you have to do is enter three of the variables (I will explain more on this later) and the calculator will compute the fourth one. This means no more logarithms or decimal exponents!
 
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Step 1Creating the Program

Creating the Program
 The name of the program can be whatever you want.  I simply called it "hl" because it is nice and short.

Ti-89
To create the program, just follow the pictures. 

Ti-83 & Ti-84
I can't take screen shots on my Ti-83 so you will just have to follow my directions.
1. Press PRGM and arrow over to "NEW" and
2. Hit enter and give the program a name. (It must be 8 or less characters)
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Author:Scout Jinx