i) U(x,y) = max[2x; 2y] (mind, this is the max, not the min).

ii) U(x,y) = x^2*y^2

iv) U(x,y) = x^2 + y^2

For each utility functions above, assess whether it represents monotonic, strong monotonic or non-monotonic preferences.

For each of the utility functions above, draw an indifference curve map and by looking at the shape of the indifference curves assess whether it represents convex, strictly convex, or non-convex preferences.