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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...

The fairtrade movement and organisations linked to it strive to meet certain conditions that help improve the lives of the farmers, pickers, transporters and others involved in the growing and production ...

Invasive species can cause negative effects on biodiversity through out-competing native species, becoming a voracious top predator and killing most of the native animals/fauna (especially since if there ...

Intergrating with respect to time, you get that v = u + at. Knowing that velocity is just the rate of change of your position ds/dt = v, and sustituting the previous expression for v, you get ds/dt = u + ...