Question 4 (Technology) Determine whether the following production functions have constant returns to scale, decreasing returns to scale, or increasing returns to scale:

a) f(x₁, x₂)= 2x₁^0.6x₂^0.6

b) f(x₁, x₂)= x₁+min(x₁, x₂)

c) f(x₁, x₂)= x₁^1/2+x₂^1/2