The scatter plot below shows the relationship between the leaf length (x) and leaf width f(x), in mm, of some leaves of a tree: ordered pairs 11, 0.5 and 12, 1 and 13, 1.5 and 14, 2 and 15, 2.5 and 16, 3 and 17, 3.5 and 18, 4 and 19, 4.5 and 20, 5 and 21, 5.5 and 22, 6 Which of the following functions is best represented by the scatter plot?
