The difference between functional and nonfunctional is ... functional mostly depends on the domain or x- value in a coordinate- (x,y). I one of the x-values are the same number then the equation becomes NONFUNCTIONAL-for example: (-2,4), (-1,9) (-2,5). Those coordinates would be nonfunctional because there were 2 (-2s). It doesn't matter if the y value -(x,Y) is the same just as long as the x values are differnt numbers it will be functional.
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Polynomial vs non polynomial time complexity
Numerical data is numbers. Non-numerical data is anything else.
Regular polygon is equilateral and equiangular. Irregular polygon is non-equilateral and non-equiangular.
You answered yourself in the question.
Non-parallel lines intersect at some point, parallel lines don't.