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You may or may not be able to. The diameter of a circle with circumference 10 cm is 10/pi, a division problem. But there is no answer using rational numbers.
A rational expression
The Rational Decision-Making Model is a process for making logically sound decisions. The model comes from Organization behavior.MethodThe Rational Decision Making Model is a model which emerges from Organizational Behavior. The process is one that is logical and follows the orderly path from problem identification through solution. The Rational Decision Making Model is a seven step model for making rational and logical reasons.This method would evidently not be used for every decision within the everyday operations of an organization. However, the method would be applicable to major efforts within the problem solving and solution finding area such as team efforts and project management (as an example).For the source and more detailed information concerning this subject, click on the related links section (Answers.com) indicated below.
if it has a square root sign or any symbol (ie. x or pi) then it is irrational. everything else is
Division by any non-zero number is the same as multiplication by its reciprocal.