Question 12 (4 points) A Math 30-2 class is discussing characteristics of polynomial functions. To help review the characteristics they are examining the following example. The height of a flare after it is fired into the air can be modelled by the function y = - 5t2 + 10t + 20 where y represents the height of a flare in metres and t represents the time in seconds after it is fired into the air. Describe in words, each of the following characteristics in relation to the context of the problem given above. [4 marks] a. The y-coordinate of the vertex b. The t-coordinate of the vertex c. The y-intercept d. The positive t-intercept