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The perfect and imperfect tenses are both used to describe the past, but in different situations. The perfect tense is used to describe a completed action in the past, for example, what you did this morni...

Gorbachev oversaw a period of dramatic structural political, social and economic reform between the middle of the 1980s to 1991. His limited attempts to liberalise the Soviet Union’s economy led to signif...

The most important fact to remember with this question is that two perpendicular straight lines have gradients related by m₁ = -1/m_2. This can then be used to find the gradient of t...

While there is no exact formula for what constitutes a good history essay introduction, with differences depending on the type of essay (for example, a timed exam or coursework) and the examination board,...

The equation is of the formx²+bx+c=0This means it can be rearranged to(x+(b/2))²=(b/2)²-cTaking the square root of both sides leaves us with x.
x²-12x-45=0...