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3.42.3 Can you answer these questions?

3.42.3.1 Opacity of plane has no influence on points behind it
3.42.3.2 Tikz: Package pgfkeys Error: I do not know the key '/tikz/state' after second input
3.42.3.3 MacTex successfully installed but unable to launch

Can you answer these?

3.42.3.1 Opacity of plane has no influence on points behind it

https://tex.stackexchange.com/questions/402380/opacity-of-plane-has-no-influence-on-points-behind-it 

I created the following figure of my data points and a regression plane: 
I would like the data points above the plane to remain black but the data points below the plane to be blue. I thought this  ...
- asked by Zdenko Heyvaert 2votes
3.42.3.2 Tikz: Package pgfkeys Error: I do not know the key '/tikz/state' after second input

https://tex.stackexchange.com/questions/402642/tikz-package-pgfkeys-error-i-do-not-know-the-key-tikz-state-after-second-in 

Hey I have to illustrated some networks using Tikz and the first one looks like this, in tikz: 
\usetikzlibrary{arrows,automata} 
\begin{tikzpicture}[->,>=stealth',shorten >=1pt,auto,node  ...
- asked by Lars Nielsen 1vote
3.42.3.3 MacTex successfully installed but unable to launch

https://tex.stackexchange.com/questions/402522/mactex-successfully-installed-but-unable-to-launch 

I have successfully Installed mactex using brew as shown below 
$ brew cask install mactex 
==> Satisfying dependencies 
==> Downloading  ...
- asked by Amarjit Singh 1vote

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