9.33.3 Can you answer these questions?

9.33.3.1 How to remove terms with negligible constant from expression?
9.33.3.2 Unsolvable system of equations - NSolve takes too long to run
9.33.3.3 Use of Callout changes plot fonts and lines
9.33.3.1 How to remove terms with negligible constant from expression?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=290763

I'm working on a Notebook that requires the integration of multiple expressions (sometimes numeric, sometimes analytic). These expressions are normally of the form: 
... 
[functions] [function-construction]
 
asked by Pedro Hablespanyos https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=86624 Score of 1
answered by Alexei Boulbitch https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=788 Score of 0
9.33.3.2 Unsolvable system of equations - NSolve takes too long to run

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=290732

I am trying to solve a system of 6 equations. Here is my input values: 
... 
[equation-solving]
 
asked by joe https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=85242 Score of 1
9.33.3.3 Use of Callout changes plot fonts and lines

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=290730

When I use  Callout  to place a label above the bars on a  BarChart  a number of other things happen to the graph unexpectedly. The ... 
[plotting] [labeling]
 
asked by flyingmind https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=42253 Score of 2