a) Find the divergence and the curl of the vector field F x G, where F(x,y,z) = 2x^2yi - y^3z^2j - 2z^2k and G(x,y,z) = 3xyi - 5yzj + z^2k at (-1, 1, -1).
b) Using Spherical Coordinates, find the volume of the solid G bounded above by the sphere x^2 + y^2 + z^2 = 25 and below by the cone z = 2√(x^2 + y^2).