ANSWER
Domain:
[tex]x \geqslant 0[/tex]
Range:
[tex]y \leqslant 4[/tex]
EXPLANATION
The domain refers to the values of x for which the function is defined.
The least value of x is 0.
Therefore the domain is [tex][0,\infty][/tex].
or
[tex]x \geqslant 0[/tex]
The range refers to values of y for which x is defined.
The highest value on the y-axis that the graph can attained is 4. The function decreases without bound.
There the range is [tex](- \infty,4] [/tex].
or
[tex]y \leqslant 4[/tex]
