Geometry HELP!!PLZ

[LashaiPer18]

Research and development expenditures are given in the graph. Use the given ordered pairs from the graph to find the average rate of change in these expenditures per year. (1999,450) and (1991,50)

 

[skeeter]

average rate of change between two points = [MATH]\dfrac{\Delta y}{\Delta x}[/MATH]