For each function below, consider its level surfaces, where w = .-- 2, -1,0, 1,2.- it negative w's are allowed, or w = 1,2, 3, -- it negative u's are not allowed. Match each function with the verbal description of its level surfaces by placing the letter of the verbal description to the left of the number af the function. 1. w = x + 2y + 3z 2. w = V(x +2y + 32) Va +y +z) 4. w - Ve + 2y +32) 3. w 5. w=x+2y + 32 6. w = x +y +z 7. w = x -y - A. a collection of equally spaced concentric spheres B. a collection of unequally spaced concentric spheres C. two cones and two collections of hyperboloids D. a collection of concentric ellipsoids Ea collection of unequally spaced paralel planes F.a collection of equalily spaced parallel planes

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