Shmoop
Coordinate Proofs
How do you know you know? Prove it! The guide goes through several examples and includes a link to a video to teach learners how to work through coordinate proofs. The goal is to prove that different shapes are indeed that shape.
Other
Mf P Ltd:the Marketing Mix
This page defines marketing mix in an easy to understand format. Contains graphics and dozens of links.
Curated OER
Bized.com: The Marketing Mix
A defintion of the marketing mix as the 4P's (price, product, promotion, place). Then it discusses other components such as Market skimming, Market penetration, product-oriented and market-oriented.
Other
Sukromne Gymnazium: The Study of Economics [Pdf]
An introduction to basic concepts in beginning economics.