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Remember that the equation of a line is y=mx+c and m is the gradient of the line. The gradient of a perpendicular line will be the negative reciprocal of m ( that just means it will be -1/m). You can then us...

That's right, German has three words for English 'it'! But don't worry, there's a rule which lets you pick the right one! German nouns have grammatical gender and can be masculine (der), feminine (die), or n...

Konjunktiv I is used to indicate reported speech (when you are telling someone what somebody else has said). However, Konjunktiv I is seen as very formal, and so it is rarely used in spoken German. You will ...

First, let's assume that sqrt(2) is rational . That is, it can be expressed in the form a/b, where a and b are integers and the fraction is simplified as far as possible. So we have sqrt(2) = a/b --> 2 = ...

Have you ever tried to run the wrong way down an escalator? then you have experienced a dynamic equilibrium.You are moving up, it is moving down and yet, your actual position isn't changing. In a reaction th...