These are the x-values left to right the paretheses ( ) indicates "not equal to" a bracket [ ]
Step-by-step explanation: Domains are the x-values left to right the parentheses ( ) indicates "not equal to" like the open circle on the graph; a bracket [ ] means "and equal to" like the solid circke on the graphed line.
Range means the y-values, bottom to top (least to greatest in math lingo)