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Diffusion is the spreading out of particles of any substance in solution or of gas resulting in a net movement of an area of high concentration to an area of low concentration. Diffusion is key to the sur...

In practice it is unlikely that the conditions of a perfectly comeptitive market will exist, however these conditions are set as:

1. Many buyers and sellers in the market 

2. ...

The imperfect subjunctive is a fantastic way to pick up the extra marks needed for the top grade at A level, esepcially when used in 'Si' clauses' however it is one of the most complex grammatical structu...

The pronoun "tu" is used in informal contexts. Situations where it should be used include:

• when you are speaking to someone in an age group close to yours

• when...

a) What can we find from what we have been given?

dx/dt and dy/dt

How can we relate these values to dy/dx?

In the context of equations that only contain two variables, their derivativ...