Finding the prime factorization of the number inside the radical
I belive the synonym he is using is : passionate
-Hope this helps.
The definition of communal is "Shared by all members of a community; for common use."
I would say that their kitchen <em>is</em> communal because their "community" consists of all the roommates who use the kitchen and contribute to it. If only one person contributed to the kitchen stock, then it would not be communal.
<span>The pungent odor of too-old trash permeated my nostrils as I burst into the kitchen. gsh</span>
It is important because the sources tell you whether the article was credible. When you have an article that has bad source, you are running the risk of having, wrong, opinionated data. This can discredit you paper if you use it.