The first drop box option are exactly, at least, less thanDrop box 2 option are interval, domain, rate of change, rangeThe third drop box is the same as the secondThe last drop box option are a, x, f(x), b

Solution
A function is a relation where each input value is assigned to AT LEAST one output value
The DOMAIN of a function is the set of all input values, or x-values, for which the function is defined.
The RANGE of a function is the set of all output values, or y-values, for which the function is defined.
To write the equation y = ax + b in function notation, substitute f(x) for y.