ITS URGENT I WILL GIVE MORE REVIEWS

(1) Find the equation of tangent planes to the surface fix, y) = 4x2 + 53631 y2 at (1915 1)' 2) By using double integrals, find the surface area of the portion of hemisphere z = V 25 x2 3/2 that lies above the region R by the disc 362 + y2 S 9 3) Find the centroid of the solid G bounded above sphere x2 + y2 + Z2 = 4 and below by cone Z = V962 + 3,\". Assume that the solid has constant density is equal to 1