Answer:


Step-by-step explanation:



The interval notation will be:

The contrary,

is 
Any Whole or Rational Number, 1 can be used as an Example if you want it Simple
It’s not loading for me,it’s prob my wifi or phone, I’ll try to solve when it loads
8n- (2n-3) =12
8n-2n= 12+3
6n=15
n= 2.5
Hope this helps :)