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a)    First we can rewrite y=arccos(x/2) as cosy = x/2 which allows us to use implicit differentiation to easily differentiate each side. Taking d/dx of each side gives u...

There is a total of 7! possible ways in which the seven children can be seated on the bench. The number of favourable arrangements when four boys are seated on one side and three girls on the other side i...

A way in which imperialism was an important cause for the First World War was the German wish for expansionism. The policy of Weltpolitik, which was adapted to help Germany gain "her place in the sun...

All cells and hence all living organisms show life functions that make them distinct from the non-living world. These include: 1.    Nutrition - the cell's ability to acquire food and res...

Primary succession begins with newly formed land such as bare rock of volcanic island.  Pioneer species such as lichens and mosses colonise the rock. When these pioneer species die organic matter builds u...