can you explain step by step how to sketch the region of integration in the xy-plane and change the order of integration for

^{1 /4} f(x,y)dx dy

0 arctan x

and I need step-by-step instruction so that I can understand this one: Can you show me how to sketch E is a solid where x² + y² z 4?

Can you explain to me whether the triple integrals should be positive, negative, or zero and why that is?

4-z dV

y dV

thank you