9.38.3 Can you answer these questions?

9.38.3.1 Subtract ParametricRegions from each other

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=292430

I have 2 surfaces defined parametrically that overlap. I want to subtract the helical surface from the cylindrical surface to obtain a mesh of just the blue surface in the image. The parameter bounds ... 
[plotting] [regions] [geometry] [mesh] [computational-geometry]
 

asked by Ariana Fenris https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=88731 Score of 1

9.38.3.2 NonlinearModelFit of data with errors

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=292268

Experimental data points invariably come with errors. These errors can significantly influence the parameters and their uncertainties when performing non-linear fitting. However, NonlinearModelFit ... 
[fitting] [nonlinear] [around]
 

asked by   https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=9950 Score of 2

9.38.3.3 Is the Mathematica Language a LISP?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=292291

The syntax of the language is centered around M-expressions, which is equivalent to LISP's s-expression. 
While the evaluator behaves differently than many LISPs , mainly being term rewrite with ... 
[lisp]
 

asked by Ehab Shoubaki https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=69268 Score of 2