Definition: The associative property states that you can add or multiply regardless of how the numbers are grouped. By 'grouped' we mean 'how you use parenthesis'. In other words, if you are adding or multiplying it does not matter where you put the parenthesis.
Full Definition of ROSIN. : a translucent amber-colored to almost black brittle friable resin that is obtained from the oleoresin or deadwood of pine trees or from tall oil and used especially in making varnish.
The names comes from the rosin used in the paper, the process of sizing it to add the rosin, and its use by builders. Alum-rosin size was invented by Moritz Friedrich Illig in Germany in 1807... and is known to have been used as a building paper by 1850.n building construction red rosin paper is used to reduce air and moisture flow through a wall or floor, create a slip sheet so different materials can slip by each other as they expand and contract, keep dust from working down through a floor, minimize squeaking, and sometimes as part of built-up roofs.