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The most important thing to do before you even start writing your essay is to plan out what you intend to say. Organise the ideas you wish to express into sections with a clear introduction and conclusion...

We begin by discussing what a Production Possibilities Frontier (PPF) curve is. It is a curve that shows the various combinations of two goods (say cycles and dictionaries) that a firm can produce with gi...

To expand the brackets you need to multiply each item inside with the number on the outside. The first bracket is expanded as follows: 5x = 5x, 53 = 15, therefore 5x + 15. There is a minus sign i...

In the Sun the main fusion process is the fusion of hydrogen nuclei to form helium nuclei. Any two hydrogen nuclei repel each other as they are both positively charged, for the fusion to occur the two nuc...

example: solve the simultaneous equations 3x+2y=4 and 2x+y=3

1:   3x+2y=4
2:   2x+y=3

want to either get same number of x's or same number of y's in equa...