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Chapter 11.5, Problem 6E Step-by-step solution Step 1 of 4 6. (a) The set of points on an exponential curve; not a convex set. Step 2 of 4 (b) The set of points lying on or above an exponential curve; a convex set. Step 3 of 4 (c) The set of points lying on or below an inverse U-shaped curve; a convex set. Step 4 of 4 (d) The set of points lying on or above a rectangular hyperbola in the positive quadrant; a convex set.