Goal and options: rubber band
output answer: hold poster in a roll

Goal and options: to create a recycled bottle-cap flower
output answer: Use an epoxy glue and go around the edge of a tin can lid and attach each bottle-cap petal to the lid. Attach a regular lid to the center of the can.

Goal and options: How do I determine how high to knit a hat?
output answer:
To determine the length of your hat, you can try it on or refer to a hat size chart.