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Simultaneous equations have at least two unknowns that must have the same value in each equation. This means the value of x and y in both equations must...

The possessive adjectives in French indicate that something belongs to someone. For example: my pen, her house, our school.In French they are as follows:...

The separation of powers is where the political system is divided into three 'branches' and power is divided between these branches. These branches are: the legislature (the body that makes laws - in the ...

Waterfalls form where a river is flowing over hard rock lying on soft rock. The soft rock is eroded faster, so there is a step in the river which deepens over time. It is eroded by hydraulic action and ab...

This effect is called diffraction. This occurs when waves spread over obstacles or through gaps.