2. The population of Montana, in thousands of people, can be modeled by P(t) = 0.04t + 1.3t + 530; where i is the number of years since 1920. a) Determine the average rate of change in P between t = 80 and 1= 100. Round your answer to one decimal place if necessary. Include appropriate units in your answer. b) Write a complete sentence which interprets the meaning of your answer in part a in the given context. 169