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  I have choose a quadratic equation as a common question . This is for both GCSE & A-level student. (2x)^2-x-1=0
To solve this equation we have four methods:- Factoring Completing square Quadrat...

The best way to tackle this sort of worded problem is to create a solvable equation. Lets call the bill before the voucher was used, X. So, the price after the voucher was applied is: = X...

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Let's first break down the concepts involved in this question. Price elasticity of demand is the responsiveness of the quantity of a good demanded to changes in the price of that good. Cross price elastic...

There are two solutions here which must be found. Both 2 red pens and 2 black pens being selected.
First the red pensIf the total number of pens is 11 and number of red pens is 3, the probability of ...