please help to solve these questions. I would appreciate the help.

1) Find the center of mass of the lamina occupying the top-half of the disk :32 + y2 g 9 if the density is given by 5(1',y) = 5 + a: + y. 2) The following integral is written in cylindrical coordinates; write the integral in spherical coordinates. (You do not have to evaluate.) 21r 3 3 f f f r4 006263m9 dzdrda 0 0 r