Could someone explain how to find the maximum point of TP? As well as the second question; I don't understand the relationships between the different curves :(

Question 11 1 pts The Total Product equation is as below: Q = 2L2 16L + 20 The TP is maximum when L = 6 O The TP is minimum when L = 4 O The Marginal product is equal to O O The average product is positive when L = 4 Question 15 1 pts Which of the following statements concerning the relationships between total product (TP), average product (AP) and marginal product (MP) is not correct? O AP continues to rise so long as TP is rising. O AP reaches a maximum before TP reaches a maximum. O TP reaches a maximum when the MP of the variable input becomes zero. O MP cuts AP at the maximum AP