It means that when you are doing the right thing you have no anxieties or worries that bother or alarm you if the question of how you handled something arises, particularly to keep you awake and uncomfortable.
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It means that two expressions represent the same number.
It means to find the numerical value of the expression.
Pillow can be used as a noun or a verb. There are two meanings to it. Using pillow as a noun refers to the object we use for sleeping or as a part of the cushion in a furniture. Using pillow as a verb may mean in support of or as protection against blows. Example: "During a heavy wind and rain, Elizabeth pillowed her child with her body." or "Too exhausted to run, he found the closest mound of dry earth to rest as on a pillow." However, in writing, it's best to keep it simple - pillow works best as a noun.
For each of a list of algebraic expressions, find one or more common factors and factorise the expression.
Be more specific what is a "term" and an "expression" I am gonna assume by term you mean terms of a sequence, of course you can. Take a sequence of functions, each function is a graph, some of them can be written as expressions. My argument is definitely Calculus.