Step-by-step explanation:
2) Slope can be written as rise over run:
- rise: add to the y-value
- run: add to the x-value

3) Slope formula is: 

4) Average rate of change is the slope of the given interval:
a) when x = 0, y = 0 and when x = 1, y = -3

b) when x = -2, y = 0 and when x = -1, y = 3

c) when x = 0, y = 0 and when x = 2, y = 0
