T1. A baseball is hit and is flying into the air. Its height can be described by the equation y = -0.5 (x + 1) (x - 19) where y is the height in inches and x is time in seconds.

a) What are the zeros of this relation?

b) What do zeros mean in this situation?

c) What is the axis of symmetry and what does it represent?

d) Use the axis of symmetry to find the vertex and explain what the vertex means for the baseball.