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Note the following rules for simultaneous equations: 'Same sign subtract' and 'alternate sign add'. The first thing we need to do is find either y or x. To do so here, you add the equations together because ...

An introduction comes at the start of the essay and should outline what you are going to say. The middle of the essay is the space where you say what you want to say, and in the conclusion, you say what you ...

Let x = 0.436363636... 10x = 4.36363636....1000x = 436.36363636...990x = 432x = 432/990 = 24/55

The first thing to do when writing your exam essay is to breathe! Take a moment, read the question through a few times to make sure you’ve absorbed it, and relax. When I’m in an exam, I always highlight or u...

The chances of Alice winning a game is 0.7, therefore the chances of Bob winning a game is 0.3. To work out the probability of Alice winning exactly one game, the probabilities of Alice winning once and Bob ...