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They are used to access locations from last indexes of any array. So lets say you want to print last two items of an array you will write print(A[-2:]) or if you dont want to display last 3 items of the ...

There are 2 methods of solving this: completing the square or calculus, which makes this a versatile question for both GCSE and A Level students. It is also fairly simple to adapt.
Using calculus, th...

Systematic desensitisation is one of the main behavioural treatments for phobias. It is based on classical conditioning, with a focus on counterconditioning the specific phobia, i.e. unlearn the maladapti...

First rearrange x - 2y = -3 by adding 2y to each side to give x = -3 + 2ySubstitute this into the first eq. to give 3(-3 +2y) + y = 19Expand brackets first: -9 + 6y + y = 19Rearrange and simplify by colle...

An introduction begins an essay in the most clear and concise way possible. It's important to immediately state what texts you'll be analysing and refer to any authors using their whole name the first tim...