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Firstly we identify the problem, in this case we have 2 equations which contain a total of 2 unknowns, it is therefore simultaneous equations.Our first step is to rearrange an equation of our choice to gi...

Imagine a long line stretching from the present moment all the way back into the past. We can explain these two tenses by the way we mark them on the line. The preterite tense, generally representing past...

In terms of organisation, the League failed because it was too Eurocentric. When the Manchuria crisis unfolded it took the Lytton Commission 12 months to reach a decision because of the distance between E...

There are three trigonometric ratios: sine, cosine and tangent, shortened to sin, cos and tan. Firstly, let's draw a triangle and label the sides. In a right-angled triangle, we call the bottom side betwe...

First, we need to work out the difference (increase) between our two numbers:420 - 30 = 390
Second, we divide the difference by the original starting number:390 / 30 = 13
Lastly, we multiply thi...