Question 3: Two rows of three cattle pens are going to be built using 400 meters of fencing. Each pen will be rectangular, the same size and the pens will form a single larger rectangle. (a) Find a function A(1) that models the total area of the entire enclosure in terms of the length / of one of the sides of the larger enclosure. (b) What are the dimensions of the entire enclosure that maximize the total area?