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The area of this rectangle is 56 cm2 length = 3k+2 and width = 7 - Find the value of k

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 len...
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Answered by Ayat B. • Maths tutor
3760 Views

How do you simplify the square root of 18 without using a calculator?

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 how ...
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Answered by Richard B. • Maths tutor
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How to define the term "external costs"

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 &quo...
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Answered by Fred E. • Economics tutor
4347 Views

Solve the following pair of simultaneous equations 1)x+3y=11 2)3x+y=9

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+3 y =11 -->> x+3(9-3x)=11 -->> x+27-9x=11 -->&g...
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Answered by Tutor94832 D. • Maths tutor
8080 Views

Why is the demand for food relatively price inelastic?

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 in ...
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Answered by Fred E. • Economics tutor
3557 Views