I’m not sure I only answer these for the points :)
Some symbols are missing. I'm assuming you meant to put in a horseshoe symbol like so

If so, then the contrapositive of that would be

which is the final answer.
The tilde sign

means "not" so writing

means "not q" which is the complete opposite of q.
Yes here’s some other versions of pi you can use
Divide both side by 2 ad you get x=80
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