For q 4 it would follow by transitivity.
If you draw a figure in which the indifference curves cross. Say the point of intersection of the two ICs is C .
A is a point on IC' and B is a point on IC".
The consumer would be indifferent between A and C and between C and B. So by transitivity he would be indifferent between A and B. But one of the points either A or B would have more of both goods , so positive MU would imply that he prefers that point to the other.
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