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🤚 I know, I know the formula: "Fillet of a fenny snake, In the cauldron boil and bake; Eye of newt and toe of frog, Wool of bat and tongue of dog, Adder's fork and blind-worm's sting, Lizard's leg and owlet's wing, For a charm of powerful trouble, Like a hell-broth boil and bubble."
A function is a special type of relation. Like a relation, when you input a number it provides an output number. However, for it to be a function and not just a relation, then for any input number there will never be more than one output.
There are 2 minor mistakes in this video. 1) The first time I write 40,000 I write 4,000 instead (it should be 40,000) 2) At the end I label the vertical asymptote as x=0, it should say h=0, as h is our independent variable (not x).
Truthfully I've seen them both ways. I've seen them written as vectors and I've also seen the written as the scalar coefficient to their respective unit vectors. I think it might even depend on who you ask or what branch of science or math you are studying. Either way, this is likely just semantics at the high school level. Here's a link to a related articles that you might find interesting. www.grc.nasa.gov/www/k-12/airplane/vectpart.html
