Question 3. (15 points) For each of the following document if the function has increasing decreasing or constant returns to scale, explain why: a) y=x1+x2 b) y=2x1+3x2 2/3 2/3 c) y = x1 X2 d) y = min{2x1;x2) e) y = min(x,;x2}2 f) y = (x, + x 2 ) 1/B