STANDARD F.IF.A.1
AI

Understand that a function from one set (called the domain) to another set (called the range) assigns to each element of the domain exactly one element of the range.  If f is a function and x is an element of its domain, then f(x) denotes the output of f corresponding to the input x.  The graph of f is the graph of the equation y=f(x).  Domain and range can be expressed using inequalities, set builder, verbal description, and interval notations for functions of subsets of real numbers to the real numbers.