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13. Givenz = x2 + y2 a) What is the 3D shape of this surface called? (Sphere, Paraboloid, Ellipsoid, Hyperboloid of one sheet, Hyperboloid of

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13. Givenz = x2 + y2 a) What is the 3D shape of this surface called? (Sphere, Paraboloid, Ellipsoid, Hyperboloid of one sheet, Hyperboloid of two sheets, Cylinder or Cone)? b) Find the equation of the tangent plane to the surface at (2, 1, 5). Simplify

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