This is what they did:
They came up with lots of different strategies. I tried to help the ones who were stuck at the beginning by asking how much money they would have if they had 18 quarters.
Next up, Vroom Vroom! This is a Fawn Nguyen activity so you know it's good. I decided that I wanted to leave this one more open-ended and not give students a handout including a table, graph, room for an equation... My students have done a lot of different activities where they have had to collect data and come up with a model so I thought they should be able to figure out what to do with this one without scaffolding it. This is what I showed them: