A group is asked to memorize a list of 20 words and then to recall as many as possible later. An equation that models the relationship between the position of the word on the list, , and the number of people in the group who remembered the word, , is .

Function on a coordinate grid with 20 points, origin O. Horizontal axis from 0 to 22, by 2s, position of word on the list. Vertical axis from 0 to 100, by 10s, number who remembered the word. Approximate points include 1 comma 90, 3 comma 75, 10 comma 45, 13 comma 42, 19 comma 55, and 20 comma 59.

What do you notice? What do you wonder?