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The first step in answering any maths question is to identify key words or key information. Key information is area, length and width. We have been told that the total area is 56cm2. We know that area is ...

Surds can be simplified if the number in the square root has a square number as a factor. It is also worth remembering that SQRT(ab) = SQRT(a) x SQRT(b). So if you combine these two points, lets look at h...

There are many acceptable definitions of "external costs" but if you have the basic understanding of what it is then you should be fine. Firstly you know that it is a negative effect/impact by &...

Rearrange equation 2 to make y the subject, then substitute the y expression into equation 1 and collect like terms: 3x+y=9 -->> y=9-3x x+3y=11 -->> x+3(9-3x)...

Food is price inelastic because there is no alternative or substitute good that we can consume in order to sustain life. Therefore if the price of food increases we still require it to survive, resulting ...