Determine whether the following production functions exhibit constant, increasing or decreasing returns to scale. Show your work and explain.
(a) Q= 0.6X + 20Y + 10Z
(b) Q= 200+ 4L
(c) Q= 20L + 16K + 10LK
(d) Q= 2A2+ 3AB + 5B2
(e) Q= 20L0.25K0.70
(f) Q= sq.rt.(3X2 + 2Y2 + 15Z2)