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You should think of the preterito perfecto as the present perfect in English and the preterito indefinido as the past simple. Indeed, you use the preterito perfecto (present perfe...

First, take a moment to read through the poem and work out what it is quite literally about. It may take a couple of read-throughs to wrap your head around this, but this is nothing worry about, poetry ca...

Find the difference between each term in the sequence. Then find the second difference, i.e. the difference between each of the primary differences. Divide this by 2, to give you the coefficient of n^2. N...

There are 2 sounds heard by a stethoscope, the so called 'lub dub'. The lub being the closing of the atrioventricular valves (i.e. the valves between the atria and the ventricles). This is caused by an in...

First, when faced with a question like this you must factorise the expression. So we need to factorise x²-5x+4 into 2 linear parts. (Linear terms are terms without any powers of x). To do this,...