Help understanding a volume problem in xyz

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$z=y^2$, $x+2y=4$, $x=0$, $y=0$, $z=0$. How do I find the volume? I tried graphing it, since it's restricted to the first quadrant. How exactly would I determine the volume? I'm not sure what $f(x,y)$ is, also the limits are kind of fuzzy to me.