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At A-Level, a comprehensive range of factors contributing to an event/phenomenon will be very impressive. In tryign to achieve this, however, it is important not to omitt any of the crucial factors- ye...

First thing we have to do is to eliminate one of the variables, either x or y (it doesn’t matter which one). In order to achieve that, we aim to have the same co-efficient (number in front of x or y) o...

Diagrammatically, this is where the demand and supply curves meet. The demand curve shows the quantity demanded by consumers at different prices, and the supply curve shows the quantity producers are w...

Answer: 00110111
Thinking: Two possible ways of answering this question expected for A Level and even at GCSE, let's start with the most common.
- Method one - consider th...

Here we need to use the chain rule because we have a function (natural log) of another function (x^2+3x+5). Let u=x^2+3x+5, and differentiate lnu with respect to u, this gives us 1/u. Then we different...