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Firstly, you need to be concise. Your introduction should set up your arguments for the rest of the essay. In terms of A-Level, you also need to consider hitting the Assessment Objectives, and one of the ...

The easiest way to find the relative minor of a key is to count down three semitones from that note. For example, for C major (no sharps, no flats) you would need to count down three semitones from C. Thi...

dy/dx = 6x² + 4x + 9

dy = (6x² + 4x + 9) dx 

integrating gives:

y= (6x³/3) + (4x²/2) + 9x + c

y= 2x³ + 2x² + 9...

The covection current forms because the base of the pan heats up as it gains energy from the stove via conduction, the pan then subsequently heats the water that is close to the bottom. As the water gains...

Balance the carbon atoms first by adding a 4 in front of the CO2,

Then balance the hydrogen atoms by adding a 4 in front of the H2O, 

Count up the number of oxgens on the right hand side: (4...