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3 Answers

2005 the number was 43, 510
2009 the number reduced to 33, 963
Rate of change is simply the same as slope = m
(y2 - y1) / (x2 -x1)
(33,963 - 43,510) / (2009 -2005)
you should get something over something and that is your rate
The rate of change is equal to the change in "y" over the change in "x".
To find the average rate of change in this story problem, we need to find the change in number of deaths divided by the change in the years (or number of years).
So rate of change in the number of deaths = (deaths in 2005)-(deaths in 2009)
Then solve the equation.  The rate of change should be negative since the deaths are decreasing every year.  It is important to remember that the rate of change is simply the slope.  
I hope that this helps.