Question

Write a function that represents the amount of money she makes

Answer 1

Let "x" represent the number of hours Elisha works, if she gets paid $13 per hour, the amount she earns after working "x" hours can be expressed as $13x.

So the function that expresses he earnings is

`f(x)=13x`

Now, this is true only for values of x greater than or equal to 0, since it makes no sense for someone to work "negative hours" the variable x should not take negative values.

The restriction for the domain can be expressed as follows:

`\mleft\lbrace x|x\ge0\mright\rbrace`