Answer:
-4
Explanation:
Given the function :
c = – 4n + 60
Where, c = cost of participation ;
n = number of persons
The cost equation can be related to the slope intercept, equation ;
y = mx + b
Where, m = Slope or rate of change
b = intercept
Comparing the slope intercept equation to the cost equation ;
m = - 4 ; Hence, the rate of change of cost is - 4