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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
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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
8082 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
3559 Views

How to solve the inequality 1 - 2(x - 3) > 4x

Firstly you should expand the brackets in this situation in order to collect the like terms, so get all the x's on one side and all the constants on the other side of the inequality. Expanding the bracket yo...
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