Hey there can someone help me on that question im stuck since 2 days ! Thanks !!

4. Production managers at a manufacturing facility estimate their production function to be: TP = 9L+3L2L3 Where TP is the number of wind turbines, L is labour and K is capital. Illustrate your answers using diagrams. Label the values on the diagrams. (5 marks for graph) 3) What are the equations for APL and MPL? TP AP MP b) At what level of input does AP peak? c) At what level of input, do diminishing returns occur? (1) What is the maximum output that can be produced