Question: Do you expect the average rate of change (in units per year) of each of the following to be positive or negative? Explain your reasoning.

Do you expect the average rate of change (in units per year) of each of the following to be positive or negative? Explain your reasoning.

(a) Number of acres of rain forest in the world. 

(b) Population of the world. 

(c) Number of polio cases each year in the US, since 1950. 

(d) Height of a sand dune that is being eroded. 

(e) Cost of living in the US.

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