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
For 1. see https://web2.0calc.com/questions/help-is-needed_7#r5
+660 
