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Formula questions - is it possible to use formulas for variables?

Question asked by Derrick Genova on May 5, 2017
Latest reply on May 5, 2017 by James Jones

Hello!  I'm looking to write a halflife problem like this.  Fermium-257 has a halflife of 100 years.  If you have [x] grams of it now, how much will you have in [y] years?  However, I want y to be only in multiples of 100, and as far as I can tell, I'm only allowed to define y with integers at best.  So, what I'm trying to figure out, is it possible to write in the question with a formula?  Like, instead of [y] years, could I have [y]*100 years?  So far it doesn't seem to be working, but I can't think of any other way to do this type of problem.  Thanks!