The lesson link and attached below involves students using pretzels and other scenarios to analyze the difference between linear and exponential functions. See link/attachment for the full lesson w/graphs and tables.
Lesson guidelines: http://auhsdmath.pbworks.com/w/file/fetch/67668917/1.2%20Proportions%20Pretzels.pdf
Big Steps: http://auhsdmath.pbworks.com/w/file/fetch/67668916/1.1%20Proportions%20BigSteps.pdf
Pretzels: http://auhsdmath.pbworks.com/w/file/fetch/67668917/1.2%20Proportions%20Pretzels.pdf
Buying Fruit: http://auhsdmath.pbworks.com/w/file/fetch/67668918/1.3%20Proportions%20BuyingFruit.pdf