This task is about translating a given English language sentence to Spanish.

That's the key; developing brains.
Esa es la clave: cerebros en desarrollo.

It's saying that the composition of f inverse with f, has to be equal to the identity matrix. So essentially it's saying if I apply f to some value in X-- right, if you think about what's this composition doing-- this guy's going from X to Y.
Lo que resulta interesante de las funciones identidad es que si

So here's our little solar system, as we pull away from our melted planet here.

Aquí está nuestro sistema solar, nos alejamos del planeta fundido.

