It means "in your backpack".
¿Qué hay en tu mochila?
En mi mochila tengo cuadernos, libros y lápices para la escuela.
en tu pagina is Spanish for in your page
your backpack
Pretty sure, just from memory... it is "What is in your backpack and How many doors are in your house" odd sentence.
It means "in your backpack".
It's Spanish for "in your community."
Me gusta su / tu / vuestra mochila.
It is Spanish for in your extended network
Tu nadas EN la pisCina = you swim in the fishpond/swimming-pool
Translation: What do you have in your case (e.g. pencil box or jewelry case)?
It means "you study your Spanish in school".