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Radians are used a lot in A level maths because at higher levels, they allow for simplification of trigonometric functions. For example, when using radians, it can be said that: Sin(angle) ≈ angle Cos(angle)...

First Past the Post (FPTP) is an electoral system where the country is divided up into constituencies. Each constituency sends one representative to the Parliament. Every voter has one vote and casts it for ...

A process by which organisms which are most suited to the environment that they live in are more likely to survive and therefore to reproduce, passing the characteristics which made them most suitable on to ...

The social exchange theory relates to relationships. The theory proposes that relationships are based on weighing up the costs and benefits, and if the costs outweigh the benefits, the relationship will resu...

1st step: we multiply the equation by (4-y) and we get: x(4-y)=(2y-1) 2nd step: we bring the equation to the form: 4x-xy=2y-1 3rd step: now we isolate all the y terms on the same side: 2y+xy=4x+1 4th step: w...