In Exercises 4144, if possible, find (a) (b) (c) and (d) A B, A B, 4A, A 3B. A 5711422 B 042031240A

L16 - 7 ex. Let Y (N)beteifnarrpsa function of the nitrogen level N in the soil. One model is N Y (N)= , N ≥ 0. 1+ N 2 a) Find the average rate at which the yield is changing between N =1a nd N =3 . b) For what nitrogen levels is the yield increasing Decreas- ing When is the yield maximized