The answer is the 3rd one a la biblioteca
The te part of the negative command would involving tú would be
Before the command
For example: you need to clean yourself
Correct way to say it: Tú te necesitas limpiar
If you represent the number of gallons of water in a tank after hours, write two equations that represents the amount of water in a tank
Juan es un amigo y ana es una amiga.
hope that helps, God bless!