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The first step is to assess whether there are any plus or minus signs anywhere within the fraction. If not: separate the denominator into brackets, for instance if the denominator contained 2x you would s...

The answer is a proof so is best shown during the interview via the whiteboard. For reference this question was in the news a few years ago and was considered difficult for GCSE students at the time.

Firstly, we need to make 'x' the subject of the equation. We do this by 'moving' everything that isn't an x over to the other side of the equation. When we do this, the main thing to remember is that what...

The activation energy is the minimum amount of energy that particles need to collide with for the reaction to occur.

A large surface area to volume ratio will decrease the rate of heat loss from the penguin. In the cold environment of Antarctica this means that the penguin needs to expend less energy to maintain its bod...