I have a couple problems about calculating volumes between surfaces and I don't feel 100% confident about my answers. Is there an easy way to check my answers? I'm not very wolfram-savvy, as I failed to even figure out how to plot all the surfaces in one graph. Is there a way to use wolfram or some other tool to check my answers? Failing that, I could just type up the integrals but I figured I could save everyones time by asking the above. Any suggestions?