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The key thing to understand here is that freight transport is a derived demand because it arises as a consequence of an increase of demand for something else. In this case, GDP is increasing therefore the...

Making off without payment is defined under S.3 Theft Act 1978. A person may be found guilty of the offence if they dishonestly make off from the spot where payment is required or expected for goods suppl...

For x!=0, multiply the equation by x to get x^4+5x^2+1=0. Then substitute t=x^2 where t>=0. So the equation has a form t^2+5t+1. Then find the discriminant and two roots. One of the roots t2<0 doesn...

Get a line a form y=-ax/b-c/b, then substitute into a cirle equation (x-p)^2 +(y-s)^2=r^2. Get a quadratic and find whether a discriminant is equal to zero. If it is then the line is tangent to a circle. ...

The important part to any History A-Level is the structure, as it not only shows the examiner your understanding of the question but also your level of knowledge. As an effectively structured argument can...