5 points) Answer the following questions: Show that Young's Theorem holds for the following function........................ (5 points)

b) Let , where , and

Find the partial derivative (5 points)

c) The foreign demand for our exports X depends on the foreign income Yf and our price level P:

Find the partial elasticity of foreign demand for our exports with respect to our price level. (7.5 points

d) If production function is , where is an increasing function of , and

, and..................... Find the rate of change of output with respect to time? (7.5

points)