My given problem is as follows: Given that rho = x^2 + xy, calculate

integral rho dS over the region y <= x^2, 0 < x < 1.

I'm not sure how to set up the integration. I don't understand how to use the

y <= x^2 info as far as setting up an integral. The text I'm using is horrible in terms of lack of examples and numerous errors. I could use some help.