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f(c) means let x=c. Remember that c is just an unknown number. The expression f(c)=9 means that when we put c through the function f(x)=7-4x, it gives the answer 9. Therefore we know 7-4c=9 is true. Now we h...

A high grade in GCSE Biology requires you jumping through a few hoops. For certain questions, specific facts are required in the answer and certain structures are required for the answers. There isn't too mu...

Structure each paragraph as PEE: point, evidence and explanation. If you follow this structure each paragraph will be clear and easily understandable. Each paragraph can be pretty short if you do this right,...

Waves are a way that energy is transferred from one place to another. There are two main types of wave, Transverse and Longitudinal. In both types of wave, energy is transferred in one direction, even though...

The easiest way to solve simultaneous equations is to label the equations so you clearly follow them throughout. For example, say you are asked to solve the unknowns for the simultaneous equations 3x-y=8 and...