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2.8.3 Can you answer these questions?

2.8.3.1 Odd Coloring with GeoRegionValuePlot
2.8.3.2 Find regions in which the roots of a third degree polynomial are real
2.8.3.3 Works with example numbers, but not with variables alone
2.8.3.1 Odd Coloring with GeoRegionValuePlot

http://mathematica.stackexchange.com/questions/99478/odd-coloring-with-georegionvalueplot 

 
When I'm plotting data with GeoRegionValuePlot, I'm getting some strange coloring errors: 
 
 
The grid included shows the top 10 countries with arable land per population. However, Australia is colored  ...
- asked by DavisDude 1vote
2.8.3.2 Find regions in which the roots of a third degree polynomial are real

http://mathematica.stackexchange.com/questions/99167/find-regions-in-which-the-roots-of-a-third-degree-polynomial-are-real 

 
I have to find the roots of a third degree polynomial in $\phi$ that depends from 3 parameters, namely $t,s,w\in \mathbb R$. In order to do that I've used the command Solve, in the following way: 
 
...
- asked by Claretta 5votes
2.8.3.3 Works with example numbers, but not with variables alone

http://mathematica.stackexchange.com/questions/99575/works-with-example-numbers-but-not-with-variables-alone 

 
The following code prints the correct solution for variable a (2.23). 
 
But if i comment out the 5 given example numbers on top it fails. 
If i remove some of the constraints at the bottom (&&  ...
- asked by JoDo 1vote

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