Please show all your work in order to get full credit. 1.) (1 pt each) Sketch the following surfaces in IR3. (i) 3x + 5y + 15z = 15 (ii) z = 25 - x2 - y- (iii) = = V9-12 -y? (Hint: This surface is part of a sphere. What is the radius of this sphere? What part of the sphere are we talking about?) (iv) z = vx2 +y? (Hint: This surface is part of a two-sided cone. What part of the cone are we talking about?) (v) y? + 22 = 25 (vi) r + z = 3