This document discusses key vocabulary terms and concepts related to proportions. It defines variables as letters representing changing numbers, constants as unchanging numbers, expressions as operations without equal signs, and equations as expressions with equal signs. Videos are linked to demonstrate evaluating expressions, equivalent fractions, and converting fractions to percentages. Students are given examples to work through involving evaluating expressions, solving proportions as equivalent fractions, and converting fractions to percentages. The document concludes with assigning homework from the textbook and online platform.