A nature conservation organization tracks the population of an endangered species of foxes over time The population number is modeled by the function f x 1 20 7 10 000 where a represents the time in years since the organization began tracking the foxes Calculate the average rate of change for the population over the following intervals 0 10 20 30 40 50 60 70 Over which time interval did the population decline the fastest GeoGebra Graphing Calculator O 20 30 O 0 10 O 40 50 60 70