I need help with these questions please

1) Find the volume of the solid V in the first octant bounded by x + y + z = 2 and x + y + 7z = 2. 2) Let W be the region bounded by z = 25 - y', y = 5x2, and the plane z = 0. (a) Calculate the volume of the region W as a triple integral in the order dx dz dy. (b) Calculate the volume of the region W as a triple integral in the order dy dz dx. 3) The region is D: x 2 0, y 2 0, x2 + 1 5 4. Integrate f(x, y) = 24xy over D using polar coordinates