The world's population in 1980 was about 4.5 billion. Suppose the population increased at a rate of 2% per year since then. a) Write an exponential relation that models the problem. Explain what each variable represents. b) Use your answer to part a. to estimate the world's population in 2025. c) Use your answer to part a) to estimate the world's population in 1970. d) What assumptions are you making as you answer these questions?

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