10.35.3 Can you answer these questions?

10.35.3.1 Optimising three variable to achieve a result

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=308024

In the following, I want to adjust the values of  a , b , c  subjected to the condition  ... 
[matrix] [mathematical-optimization] [linear-algebra]
 

asked by seeker https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=84918 Score of 3

10.35.3.2 Relation between AccuracyGoal, PrecisionGoal and WorkingPrecision

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=308054

For a long time I have been searching for an answer to the link or the relation between  AccuracyGoal, PrecisionGoal, and WorkingPrecision . I want to use them in <... 
[differential-equations] [precision-and-accuracy]
 

asked by znp https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=103086 Score of 3

10.35.3.3 How to ClearAll["Global`*"] when I close any notebook?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=307931

Assume there are several notebooks opened. I want to ClearAll["Global`*"] when I close any notebook(by clicking the close button of the window). 
The code below is my attempt although it does ... 
[notebooks]
 

asked by metroidman https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=94488 Score of 3