It was Galileo who wrote something along the lines of, "Mathematics is the language God used to create the universe." Learning math, then, is a whole lot like learning the alphabet and basic grammar rules of a new language--you learn the symbols and how to combine them, what can go together and what can't, what interesting new sounds come from those combinations...all the basic mechanics that lie behind how the language functions. If that's where you leave it, the language exists for you, but it hasn't really come to life. The next step, to continue the story of mathematics as a language, is to take the alphabet and start to form words. This is the world of mathematic expressions. It's where we realize that if 3(2) means we have 3 groups of 2, we can extend that to say 3x means we have 3 groups of some unknown number, x. From there, it doesn't take much to move to 3t + 4.9t^2 telling us that we multiply some number by 3, then that same number is multipl...
just me, stepping out of the boat in faith, trying not to focus on the waves around me