good explanantions and the theories related to it, thank you!

05. Consider an individual whose utility function over quantities of X and Y takes the form: U = 100 X2 Y2 where U is an index of the individual's utility and X and Y are the weekly quantities of the two items consumed (for both items, quantities must be non-negative, so X 2 0 and Y 2 0). i. Are the indifference curves upward sloping or downward sloping? ii. Are the indifference curves concave or convex? iii. ls X a 'good' or a 'bad'? iv. ls Y a 'good' or a 'bad