TVO ILC MPMZD Lesson 20 Lesson 20 Assessment of Learning (13The amount of money that a local charity earns by selling T-shirts at a mall depends on the price of each T-shirt. The monthly profit, 3', in dollars is given by the quadratic equation 3' = \"'55": +1250" ' 5500 where .1: represents the price of each T-shirt. a) Determine the roots of the equation. (3 marks) b) Determine the vertex of the parabola. (1 mark) c) Draw a sketch of the relationship. Label the axes and the vertex. (2 marks) d) Under what circumstances will the charity maximize its profit (make the most money)? (1 mark) e) Describe the significance of the roots in terms of the graph and in terms of the charity's venture. (1 mark) Copyright 2013 The Ontario Educational Communications Authority. All rights reserved. 10