5.6.3 Can you answer these questions?

5.6.3.1 SourceSansPro: tabular numbers in a beamer presentation

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=474350

I'm displaying some data with pgfplotstable in a beamer presentation for my history lesson. 
The main font is SourceSansPro. I'm using it with \usepackage[semibold]{sourcesanspro} with default lining  ... 
[beamer] [math-mode] [pgfplotstable] [sourcesanspro]
 

asked by omisson https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=94317 1 vote

5.6.3.2 Error while inserting the title in each column of the table

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=474461

I have code for wherein I tried to insert the title for each column but I am getting an error. The error says: 
Missing control sequence inserted 
How to overcome this? 
... 
[tables] [longtable]
 

asked by vijay https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=163435 1 vote

5.6.3.3 Need help with preamble pathing

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=474286

In my main.tex I am requesting my preamble to be loaded through the command \usepackage{preamble}, which is in the same folder as my main.tex. My subfiles are located one folder below, e.g.  ... 
[paths]
 

asked by Richard Gao https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=181315 1 vote