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The top number is the total mass number, particles in an atom of an element that have mass are protons and neutrons. So the top number tells us how many protons and neutrons there are in an atom of that e...

So when we give an antibiotic (a drug that kills bacteria) it will kill all of the bacteria that are sensitive to it, if it's taken correctly. A few bacteria may have an adaptation allowing them to resist...

The aim of this maths question is to find the two unknowns, x and y, by using simultaneous equations. Simultaneous equations can be solved by either using the elimination method or the substitution method...

The equation looks horrible to start so we need to tidy it up. We do this by firstly getting rid of the fraction. This means that we need to multiply everything else by the denominator (which in this case...

It can sometimes be confusing to identify what case you are about to use in German due to the fact that we don't have these cases in English. However, knowing confidently what case to use is the first ste...