Please help with some earlier problems that were not answered

1. https://web2.0calc.com/questions/help-is-needed_7

 

2. https://web2.0calc.com/questions/pls-help-not-sure-if-impossible-or-if-it-s-a-number

 

3. https://web2.0calc.com/questions/please-help-thank-you_68