Question

Can anyone please explain

what a function mean? (in maths:graph,etc) i haven't learnt this but it might be useful for future references​

Answer 1

For example, the position of a planet is a function of time. ... A function is a process or a relation that associates each element x of a set X, the domain of the function, to a single element y of another set Y (possibly the same set), the codomain of the function.

Explanation: