Go to Alaska and see the Northern Lights - the beautiful Aurora Borealis
Aurora Borealis - Alaska
(Common Core Standard 9-12.A-SSE.1) Interpret expressions that express a quantity in terms of its context. This includes describing parts of an expression and grouping parts as an individual entity.
Learn and practice the following concepts tested for common core state standards initiative covering Grades 9-12 - Seeing Structure in Expressions.