Both questions

Part D: Communication (16 marks) (approximate time: 25 minutes) 19. Define the term "concavity" and "inflection point" and describe how you would find the intervals of concavity on a graph given the equation of a function. (8 marks) Use separate Graph Paper if needed, to explain. 20. A farmer whiches to enclose a rectangular lot agjacent to one of his barns with 280 m of fencing. Three sides will be fenced, and the barn will make up the fourth side. Determine the dimensions of the maximum area that can be produced with this amount of fencing. Barn Wall