Only help on the first one

(1) Consider your need to buy a cellphone. By relying on the rational approach to decision-making, decide to buy a cellphone based on at least one constraint, 3 alternative brands, 4 criteria, proper weights, and grading from 1 (low) to 10 (high.) (2) Countries A and B produce two goods (Y and X) subject to the following Production Possibilities Curves (PPCs): A: Y = 600 - 1.5X, B: Y = 500 - X comparative advantage in Y and which one in X