The domain is the set of x-values for which the function is defined for.
The range is the set of y-values for which the function is defined.
Now, looking at the graph, we see that the x-values range from
x = 0 to x = 12
And, the y-values range from
y = 1000 to y = 1500
Thus, we can say:
[tex]\begin{gathered} \text{Domain}=\mleft\lbrace0\colon12\mright\rbrace \\ \text{Range}=\mleft\lbrace1000\colon1500\mright\rbrace \end{gathered}[/tex]