1. The problem statement, all variables and given/known data The volume shown lies above a square in the (x, y) plane having corners (4, 1), (5, 1), (5, 2), and (4, 2). The remaining two surfaces are planes defined by z1 = 2x + 4y + 7 and z2 = 3x + 6y + 8. The density of this object is 880.y. Determine a) the volume of this object, and b) the mass of this object. A picture is attached 2. Relevant equations I can't use the coding on here, so bear with me: Volume of a 3D object is given by V=∫∫∫dxdydz Mass of a 3D object is: m=∫∫∫ρdxdydx where ρ is the density 3. The attempt at a solution My setup for the volume is: ∫∫∫dzdxdy Limits of integration: 2x+4y+7 < z < 3x + 6y + 8. 4<x<5 1<y<2 And for mass: ∫∫∫800y dzdxdy with the same limits of integration I've gotten 8.5 and 10333.3 for the volume and mass, respectively, but those are wrong. Can anyone see what I'm doing wrong?