In Exercises two models R₁ and R₂ are given for revenue (in billions of dollars) for a large corporation. Both models are estimates of revenues from 2015 through 2020, with t = 15 corresponding to 2015. Which model projects the greater revenue? How much more total revenue does that model project over the six-year period?

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R₁ = 7.21 +0.58t R₂ 7.21 + 0.45t 2 ||