In my math textbook there was a question to sketch a possible graph in which it gave me some information on it. One of the questions gave me the domain and range of the function. The domain was [-5,||) and the range was [0,||). What does the double vertical lines mean here? Thanks!
Here is the picture:
I suspect the symbol was meant to be $\infty$ (infinity) but was printed incorrectly. If so, then the domain is $\{x:x\ge -5\}$ and the range is $\{y:y\ge 0\}$.