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Differentiation is the rate of change of one variable with respect to another at a point in time or space. In other words, this can be described as the slope of a curve, which is how much the curve goes u...

So here we want to eliminate one variable so we are only working with either x or y by themself, so to do this we can rearrange the first equation of x+y=1 to x= 1-y. This new equation can therefore be su...

First of all, do not worry, tens of thousands of well qualified applicants fail to secure a single place, it does not mean you are not an ideal candidate, but it is just the nature of this highly competit...

A public good is a good that is both non-rivalrous and non-excludable. Non-rivalrous can be defined as “consumption by one person does not reduce the amount available to other people” and non-excludable a...

First of all, remember to stay calm when approaching these questions and know that it is okay if you don't see the pattern immediately. Give yourself time to work out the rules and then finding the answer...