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The most important thing to remember when differentiating implicitly is that y is a function of x. Rewriting y as y(x) often makes it much clearer. For example, evaluate d/dx (y 2 ): using the aforementioned...

First, we need to find the value of t when x = 6p°C. We are told that after t minutes the temperature, x, will be 60°C; so we can insert 60 into the equation for x: 60 = 15 + 70e^(-t/40) Secondly, we can rea...

Ah yes, the question which haunted my years of study, particularly during GCSE and A Levels. At this stage, many exams are ‘open book’ - that is, you can take either a blank or highlighted copy of the text i...

In chemistry if a substance is oxidised it loses electrons in a reaction. If a substance is reduced it gains electrons in a reaction. A reaction that has both oxidation and reduction within it is called a RE...

The cardiac cycle is the series of events that leads to blood being pumped to the lungs and around the body. The cycle begins with the SAN (sino-atrial node). This is the hearts 'pacemaker'. It sends out a n...