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Imagine you're reading a book: they're not all the same. There are good features of writing to describe which can help you, and check-lists you can follow, but ultimately your piece of descriptive writ...

To highlight obligation, ie something that must be done. It can usualy be spotted with a -dum ending.

The formula for the area of a circle is π r². To use this formula we first need to find r, the radius of the circle. The radius is the distance from the centre of the circle to the edge, and...

As a university student i know all about the right address that pupils need i can really help them understand math

In this example, we want to find values for both x and y which are our unknowns. 

So we start by rearranging x to be on its own but still in terms of y. We then can plot it into the next ...