Re: absolute and this
it might be better to explain what an absolute value is. an absolute value is the value, that x is away from 0. for example; the absolute value of 4 is 4. because 4 is 4 away from 0. likewise, the absolute value of negative 4 is also 4. why? because negative 4 is also 4 away from 0. its not expressed negative because it doesn't matter if the number is negative or positive. you are just worried about how far x is away from 0. hope this helps.
the ways you might need an absolute value varies depending on the language and the type of thing you are trying to code. but refer to post 2 for an example of how to implement it in code.
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