Can it please be explained why

(1). The coordinates of P (ii). The coordinates of Pz (iii). The coordinates of P3 (b). Consider the points P1 = (0,5,2) P2 = (11, -6,8) P3 = (-8, -1, -7) PA = (3,4,6) (1). Which of the points is closest to the xy plane? (ii). Which of the points is farthest from the xy plane? (iii). Which of the points is closest to the yz plane? (iv). Which of the points is the farthest from the yz plane? (v). Which of the points is closest to the xz plane? (vi). Which of the points is farthest from the xz plane? Q3. (a). Find the equation of the spheres with center (2, -3,6) that touch or ar (i). xy plane