the presentation of the valve of the business in figure form.
http://wiki.answers.com/Q/What_is_the_importance_o...

Approximation or estimation applies primarily to problems dealing with quantities and measurements. The estimation process has a practical use in finding solutions to realworld problems
http://www.ehow.com/info_8719640_estimationimport...

Quantum chemistry is all about solving. differential equations. Schroedinger's equation is a differential equation and in the context of physical chemistry, you'll need to solve it
http://www.quora.com/Whatmathematicsareimportan...

I can't find the reference, but I read somewhere that Groupon keeps the income of all unused groupons. Edit: One reference is on this page, search for "groupon keeps" http
http://www.quora.com/HowimportantareunusedGrou...
