This reference sheet was created using a Pennsylvania state exam Algebra released item about snowfall on Joe’s driveway. My students were introduced to this problem in an earlier unit and I used it for this sheet. It is suitable for 8th Grade Math or Algebra I in preparation for the Keystone exam. It is intended to be used as a classroom poster and if you choose to use it, please let me know how you use it in your classroom!Falls under Standard - CC.2.2.8.C.2 Use concepts of functions to model r