Answer the following questions by mentioning whether they are true or false (True/False). And don't forget to give a small explanation on why it is true or false.

1- If the production function is f(x1, x2) = x1x2, then there are constant returns to scale, and the isoquant describing this technology is a straight line.

2- The production function f(x, y) = x^2/3+y^2/3 has increasing returns to scale.

3- The production function f(x, y) = x + y has constant returns to scale, and the isoquant describing this technology

is L-shaped.