The premise of the game Angry Birds is to shoot the bird from the slingshot and hit the pigs to advance to the next level. The flight path of red bird is illustrated in the image below. Given the graph, please answer the following questions.

8. What is the domain of the graph? You may round to the nearest whole number. (To make ≤ symbol, press and hold alt and type 2, 4, 3)
9. What is the range of the graph? (To make ≤ symbol, press and hold alt and type 2, 4, 3)
10. Using the vertex you found from question 3, and given an a value of -0.10, write the equation of the graph in vertex form: y=a(x-h)^2+k
11. What is the positive solution of this equation?
12.What is the equation for the axis of symmetry?
13.Is this graph a function or not? Explain.