The question is asking: Where is the girl with the backpack from?
The answer is: La chica con la mochila es de (insert where she is from).
You must have said: "¿De dónde es la chica que lleva la mochila?" To simply answer: "Es de..."
The problem with "¿De dónde es la chica con la mochila...?" Can be confusing in Spanish because this question needs a complement like the colour of the backpack. In this case, the preposition "con" must be changed by "de": ¿De dónde es la chica de la mochila roja?
En mi mochila tengo cuadernos, libros y lápices para la escuela.
to takefor example:Lleva a su hermana a la escuela. (Take your sister to school.)
En mi mochila translates to "In my bag" in English
Yo necessito un mochila! Your welcome! visit my site! freewebs.com/ibecca
It means: "we have it in school"--- en la escuela la / lo tenemos...In school we have... en la escuela tenemos...
En invierno, tú llevas..
at school is 'en la escuela, a la escuela'
En mi mochila hay ...
It means "in your backpack".
"Estas en la escuela" in English means "You are at school."
You probably mean, "...que aprendes en la escuela?" This mean, "... that you learn in school."
En la escuela --- at school to school --- A la escuela