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To differentiate y=(x²+4x)⁵ you need to use the chain rule. The chain rule uses the fact that dy/dx = dy/dt * dt/dx. 

Here we create a new variable t, where t = x²+...

Eutrophication is a negative impact of the use of fertilisers on aquatic lifeforms. When nutrients from fertilisers (eg nitrate and phosphates) leach from farm fields into the water, this allows fast-grow...

My most important piece of advice is not to be afraid of describing what you see. Refer to particular features which seem distinctive and relevant to the question even if they seem obvious. This will show...

Variations on this question can be found in all A Level courses tackling French history from the 1780s to the end of the Napoleonic era. Maximilian Robespierre has remained a central figure in public and ...

There are two types of blood vessels: the arteries and the veins. Arteries transport the blood from the heart to the tissues and the veins transport the blood from the tissues back to the heart.