B.O.B. - comment on something that I've learned

The last couple weeks we learned a lot more about functions. We learned how to describe the domain and range of a function, how to write inequalities and interval notation or what does the letter "U" between brackets means. The most exciting thing we learned the last weeks, I personally think is to graph a function. It isn't really the fact that we know how to graph it, no, it is the fact, that when we look at a graph in a coordinate system, we can write down the function. Otherwise when we see a function, what for some people just looks like random letters and numbers, we can make a picture of it!