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When integrating a function which can be defined as a combination of two functions, it can be difficult to tell whether or not to use by parts. We can spot when to use by parts if we look at the composite...

The subjunctive is most commonly used in expressions of doubt ("dudo que + subj", "no creo que + subj") and the negative and formal imperative ("no hagas eso!", "por fav...

First you would figure out how many bags of sweets Adam made, this would be done by converting 4kg into grams (x1000) so 4 x 1000 = 4000g. Then you would divide the 4000g by 250g to see that 16 bags of sw...

The point of using a substitution when dealing with integrals is to reduce the problem from a very complicated integral to a simplistic one. How can we achieve this with our integral? Well, we know that w...

The lungs have million of alveoli which increases the surface area, therefore increasing the rate of diffusion of oxygen into the lungs. The alveoli are very thin...